Mid-Canada Line
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![](/w/images/thumb/9/97/Dew_line_1960.jpg/350px-Dew_line_1960.jpg)
The Mid-Canada Line, also known as the McGill Fence, was a line of radar stations across the "middle" of Canada to provide early warning of a Soviet bomber attack on North America. It was built to supplement the less-advanced Pinetree Line, which was located further south. The majority of Mid-Canada Line stations were used only briefly from the late 1950s to the mid-1960s, as the attack threat changed from bombers to ICBMs; the early warning role passed almost entirely to the more capable DEW Line further north.
Contents
History
Impetus
Construction of the Pinetree Line had only just started when air planners started to have concerns about its capabilities and siting. By the time it detected a potential attack by jet-powered aircraft, there would be little time to do anything before the attack reached Canadian or northern U.S. cities. Additionally, the Pinetree systems used pulse-based radars that were fairly easy to jam and were unable to detect targets close to the ground due to scattering. Although expensive in terms of fuel use, it would be possible for Soviet bombers to evade detection by flying lower. They would eventually be seen as they approached the stations, but possibly so late that there would be no possibility of intercepting them. This made the Pinetree Line's usefulness somewhat suspect even before it had become operational.
Bennett Lewis, head of the AECL Chalk River Laboratories and former Chief Superintendent of the UK Telecommunications Research Establishment (TRE) had proposed to the Defence Research Board (DRB) a Doppler radar system that avoided both of these problems. Known today as a forward scatter bistatic radar, it used two antennas, a transmitter and receiver, separated by about 60 km. Any aircraft flying between the antennas would reflect additional energy toward the receiver, and the mixing of the two received signals would allow the receiver to detect the aircraft. Since the system relied on the speed of the aircraft to shift the frequency due to the Doppler effect, the radar could be aimed at static objects like the ground; although a signal would be reflected off the ground and received, since the ground is not moving this signal has no frequency shift and can be easily filtered out.
Another advantage of the system is that it requires much less power to operate effectively. A conventional pulse radar spends most of its time turned off, listening for the reflections of its own signal. To ensure the reflections have enough energy to be detected, each pulse has to be extremely powerful. In a bistatic radar the signal is continually broadcasting and even tiny changes in the frequency can be seen and amplified, so a much smaller signal is needed. Compared to the existing Pinetree radars, Lewis' system would require much smaller sites and less power.
The major disadvantage of the system is that it did not indicate the aircraft's location within the beam, simply an indication of which beam had been "broken". Lewis proposed a system in which two overlapping lines of stations would be set up, forming a continuous "fence". This not only allowed one of the lines to cover the dead points directly over the antennas of the other, but also allowed the location of the aircraft to be determined within 30 km depending on which pair of beams were broken – a distance well within the detection ranges of interceptor aircraft radar. Lewis' design would be able to see any aircraft from ground level up to 65,000 ft.
Spider Web
The DRB decided to pursue Lewis’ idea in 1950-51 by directing a research contract to the Eaton Electronics Research Laboratories of McGill University, headed by Professor Garfield Woonton. Lewis suggested to DRB and Woonton that he put the project in the hands of associate professor, J. Rennie Whitehead as project leader, a former colleague of his from the TRE days in the UK. Some preliminary tests were made in 1952 with breadboard hardware built by a graduate student, Hugh Hamilton, in order to confirm the validity of the idea.
In the meantime RCA Victor had been brought in by the DRB to design and produce the receivers, transmitters and antennae for tests on a substantial scale. The testing was performed in the summer of 1953, when Whitehead and his team of RCA Victor and RCAF personnel installed and operated a string of seven stations stretching from Ottawa to Mattawa along the Ottawa River valley. Known under the code name of "Spider Web", the tests were made with aircraft from CFB St. Hubert, near Montreal. All observations were transmitted to and made in the line HQ, which was set up in the equipment hut of one of the seven stations in Deep River. Andrew Matthews of the 104 Communications Flight at RCAF St. Hubert arranged for a series of different aircraft to fly through the network, including an Auster light aircraft, a T-33 Shooting Star, an Avro Lancaster bomber and even a recently acquired de Havilland Comet jet transport. The tests revealed a great deal about the spectral ‘signatures’ of aircraft crossing the line at different points, and demonstrated the capability to detect all sizes of aircraft from 100 ft to over 40,000 ft in altitude. During this time Dr. Ross Warren of RCA Victor and Dr. Whitehead jointly developed the theoretical background for the work in a major report to DRB.
The Spider Web trials were followed in 1954 by intensive tests on a single link, built in the Eastern Townships for Bell who had by this time been given the go-ahead for the implementation of the Mid-Canada Line. The trials on this prototype link were also conducted by Whitehead and a small team in collaboration with Air Defence Command, St. Hubert, this time on behalf of Bell. The trials involved the flyover of numbers of B-52 bombers by arrangement with Strategic Air Command and a local bombplot unit. They also had full-time use of an Avro Lancaster from CFB Greenwood for the important low-level tests. The senior uniformed member of the team, Flight Lieutenant Andy Matthews, arranged and navigated all the Spider Web and Eastern Township flight tests.
Deployment studies
In February 1953 the Canada-U.S. Military Study Group (MSG) was asked "to study those aspects of the North American Air Defence System in general, and the early warning system in particular, which are of mutual concern to the two countries." The MSG then asked the air defence commanders of Canada and the United States to prepare independent briefs on the subject. By July 1953, RCAF Air Defense Command had completed its brief, followed shortly thereafter by its USAF counterpart. Both reports suggested building a Doppler fence farther north, along the 55th parallel north, roughly at the entrance of James Bay into Hudson Bay.
In October 1953 the MSG recommended to both governments "that there be established at the earliest practicable date, an early warning line located generally along the 55th parallel between Alaska and Newfoundland", and outlined their minimum operational requirements. By the end of November 1953, the Mid-Canada Line had been approved in principle. Unlike the jointly-operated Pinetree line and future DEW line, the Mid-Canada line would be funded and operated entirely by the RCAF. The DRB estimated that the system would cost about $69,700,000, while an independent RCAF report placed it at $85,000,000.
In December an effort started to try to understand what sort of problems would be encountered during construction. Several "trains" consisting of tractor-pulled sleighs set out cross-country. One, manned by the RCAF, set out eastward from Fort Nelson, BC in order to link up with a second moving west from Flin Flon, Manitoba, while a third crewed by the Army left Lake Nipigon near Thunder Bay, Ontario for Lansdown House about 200 km further north. The missions proved that it was possible to build the new line, but only during the winter when the muskeg was frozen solid. These missions also inspired the U.S. Army to invest in purpose-built overland trains which they experimented with in the 1960s but never put into production.
While that was taking place, efforts were underway to start primary siting studies. It quickly became clear that the areas in question, at least in eastern Canada, were so remote that there was no really accurate topographical information. A huge effort to map the area in a 15-mile wide strip across the entire country was started by Transport Command almost immediately, and ended by the spring of 1954. With this information in hand a construction division was set up, the Systems Engineering Group (SEG), in February 1954, tasked with producing a final report on the system to be submitted on June 1.
Finalizing the plans
As the experiments continued it became clear that the radar stations could be located further apart, up to 90 km, reducing the number of stations required. Nevertheless, the price rose, now estimated at about $120,000,000. Although their final report was not yet ready, the SEG put in an interim report in June and it was approved by cabinet by the end of the month.
In their report they outlined the system that would be built almost exactly. It called for eight major Sector Control Centres, numbered from 200 to 900, each of which control up to thirty unmanned radar sites for a total of 90 radar stations. Each of the radar stations consisted of a single tall mast with a number of small dishes in fixed positions on top (typically four, two pointed in either direction), with power and electronics located in a building below the mast.
The sector control centres were linked using an advanced microwave communications system developed in part by CARDE, which scattered off the troposphere for long-distance communications. The southernmost site along the eastern portion of the line, at Cape Henrietta Maria on Hudson Bay, was used as the main communications point, and three additional repeater stations transferred data from the line southward to the NORAD command center in North Bay, Ontario. The easternmost station at Hopedale, Labrador was co-located with an existing Pinetree Line station in order to save construction costs.
All aircraft transiting the line would have to file a flight plan through the Mid Identification Zone, or MIDIZ, centred on the fence. The plans also called for the construction of several airbases known as Line Clearance Aerodromes just to the north of the line, where interceptor aircraft could operate in times of heightened alert.
At about this time another huge civil engineering project was underway in Canada, the construction of a cross-Canada microwave relay telephone system. Since many of the logistics problems were similar, the construction group, led by Bell Canada, was selected as a major contractor for the base construction. Detailed site selection started in 1955, with a major surveying effort running across Canada at the 55th parallel. The sites were so remote that the RCAF had to form up its first all-helicopter squadron in order to provide flight support for the survey teams.
Construction and service
Construction started in 1956 and proceeded quickly. By April 1957 the eastern half was operational, and the line was declared fully operational on January 1, 1958. Operations were shortly integrated into the newly formed NORAD. Even the SEG's revised estimates turned out to be too low, and the fence's final cost is estimated at $224,566,830.
It was not long before the RCAF started to have reservations about the costs of maintaining the Line. Although technically more capable than Pinetree, the MCL gave little information in terms of planning a response or vectoring interceptors to their targets, these tasks still required the Pinetree radars much further south. The extra time offered by the MCL was not considered worth the trouble of keeping the line operational. Even before the line became operational, in a repeat of earlier history, a new and more capable line was already under study that would combine the plotting capability of the Pinetree system with the line-breaking capabilities of the MCL, and located much further north to dramatically improve the detection and response times. Emerging as the Distant Early Warning Line, or DEW, construction started before the MCL had become operational.
When the DEW line became operational in 1957 the value of the MCL was eroded, and the RCAF started pressing for it to be dismantled. The USAF disagreed, but the western half of the line was shut down in January 1964, leaving the eastern half to help defend the industrial areas of Canada and the US. However, as the Soviet Union moved their offensive capability to ICBMs it became clear that both the MCL and Pinetree systems were of limited use, and the entire Mid-Canada line was shut down in April 1965. The operations site located at Cranberry Portage, Manitoba, for example, has been converted into a high school and residence since active operations at the site closed in the mid-1960s.
Stations
Site | Location | Coordinates | Radio Bcn | Activated | Deactivated |
---|---|---|---|---|---|
Site 200 | RCAF Station Hopedale, Sector Control Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 201 | |||||
Site 203 | Doppler Detection Station | ||||
Site 206 | Doppler Detection Station | ||||
Site 209 | Doppler Detection Station | ||||
Site 212 | Doppler Detection Station | ||||
Site 215 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 218 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 218A | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 221 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 221A | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 224 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 224A | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 227 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 300 | RCAF Station Knob Lake, Sector Control Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 303 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 303A | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 306 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 306A | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 309 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 309A | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 312 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 312A | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 315 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 315A | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 318 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 318A | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 321 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 321A | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 324 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 324A | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 327 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 327A | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 330 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 330A | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 333 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 333A | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 336 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 336A | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 339 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 339A | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 342 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 400 | RCAF Station Great Whale River, Sector Control Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 401 | Doppler Detection Station | ||||
Site 403 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 403A | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 406 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 406A | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 409A | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 410 | Cape Jones Relay Site | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 412 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | Remediated | ||
Site 413 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | Remediated | ||
Site 415 | Cape Henrietta Maria Relay Site | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 416 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 418 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | Remediated | ||
Site 421 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 424 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 427 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 500 | RCAF Station Winisk, Sector Control Station | Lua error in package.lua at line 80: module 'strict' not found. | Remediated | ||
Site 503 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 506 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 509 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 512 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 515 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 518 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 521 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 524 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 527 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 530 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 533 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 536 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 600 | RCAF Station Bird, Sector Control Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 603 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 606 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 609 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 612 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 615 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 618 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 621 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 624 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 627 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 630 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 700 | RCAF Station Cranberry Portage, Sector Control Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 701 | |||||
Site 703 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 706 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 709 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 712 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 715 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 718 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 721 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 724 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 727 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 730 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 733 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 736 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 739 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 742 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 745 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 800 | RCAF Station Stoney Mountain, Sector Control Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 803 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 806 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 809 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 812 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 815 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 818 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 821 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 824 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 827 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 830 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 833 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 836 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 839 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 842 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 900 | RCAF Station Dawson Creek, Sector Control Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 900R | |||||
Site 901 | |||||
Site 903 | Doppler Detection Station | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 050 | Fort Albany Relay Site | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 060 | Relay Relay Site | Lua error in package.lua at line 80: module 'strict' not found. | |||
Site 070 | Mount Kempis Relay Site | Lua error in package.lua at line 80: module 'strict' not found. |
POL Supply Points
Petroleums, Oils and Lubricants (POL) Supply Points were distribution centers for consumable petroleum materials used to fuel and maintain the Mid-Canada Line DDS sites. Co-located with Sector Control Stations when possible, petroleum products were received in bulk and shipped out by air from these locations.
Supply Point | MCL Sites Serviced | Coordinates |
---|---|---|
Dawson Creek, BC | 842, 900R, 903 | Lua error in package.lua at line 80: module 'strict' not found. |
Sexsmith, AB | 836, 839 | |
Falher, AB | 830, 833 | |
High Prairie, AB | 824, 827 | |
Slave Lake, AB | 809, 812, 815, 816, 821 | |
Waterways, AB | 803, 806 | |
Anzac, AB | 742, 745 | |
Meadow Lake, SK | 724, 727, 730, 733, 736, 739 | |
La Ronge, SK | 712, 715, 718, 721 | |
Flin Flon, MB | 703, 706, 709 | |
Cranberry Portage, MB | 700, 701 | Lua error in package.lua at line 80: module 'strict' not found. |
Wekusko, MB | 624, 627, 630 | Lua error in package.lua at line 80: module 'strict' not found. |
Wabowden, MB | 621 | |
Thicket Portage, MB | 615, 618, 612 | |
Ilford, MB | 606, 609 | |
Gillam, MB | 600, 536, 533, 530, 527, 524, 521 | |
Winisk, ON | 415, 416, 418, 421, 424, 427, 503, 506, 509, 512, 515, 518 | Lua error in package.lua at line 80: module 'strict' not found. |
Bear Island, Nunavut | 412, 413 | |
Great Whale River, QC | 324, 327, 330, 333, 336, 339, 342, 403, 406, 409, 410 | Lua error in package.lua at line 80: module 'strict' not found. |
Knob Lake, QC | 215, 218, 221, 224, 227, 303, 306, 309, 312, 315, 318, 321 | Lua error in package.lua at line 80: module 'strict' not found. |
Goose Bay, NF | 203, 206, 209, 212 | |
Hopedale, NF | 201 | Lua error in package.lua at line 80: module 'strict' not found. |
(as documented in December 1956)
See also
References
- Maj. D.H. Thorne, The Mid Canada Line, 1958 - 1965
- James Rennie Whitehead, Memoirs of a Boffin - Ch. 7[1]
External links
- The Mid-Canada Line: includes maps and photos from most of the stations