British Rail Class 46

Derby Type 4
British Rail Class 46

300px A Class 46 at Exeter St Davids in 1976.

Type and origin Power type Diesel-electric Builder British Railways’ Derby Works Build date 1961–1963 Total produced 56

Specifications Configuration 1Co-Co1 UIC class (1Co)'(Co1)' Gauge 4 ft 8 1⁄2 in (1,435 mm) standard gauge Wheel diameter 3 ft 9 in (1.143 m) Minimum curve 3.5 chains (70 m) Wheelbase 59 ft 8 in (18.19 m) Length 67 ft 11 in (20.70 m) Width Height 12 ft 10 in (3.91 m) Loco weight Fuel capacity 790 imp gal (3,600 L; 950 US gal) Prime mover Sulzer 12LDA28-B Generator Brush Traction motors Brush MU working ★ Blue Star Train heating Steam Train brakes Vacuum

Performance figures Maximum speed 90 mph (145 km/h) Power output Engine: 2,500 bhp (1,864 kW) At rail: 1,962 hp (1,463 kW) Tractive effort Maximum: Loco brakeforce

Career Operators British Railways Numbers D138–D193; later 46001–46056 Nicknames ‘Peak’ Axle load class Route availability 7 Withdrawn 1977-1984 Disposition Three preserved, remainder scrapped

The British Rail Class 46 is a class of diesel locomotive. They were built from 1961-1963 at British Railways' Derby Works and were initially numbered D138-D193. With the arrival of TOPS they were renumbered to Class 46. Fifty-six locomotives were built. The first was withdrawn in 1977 and all of them were withdrawn by the end of 1984.

Overview

The Class 46 design was structurally the same as the preceding Class 45 build, and had the same Sulzer engine, but differed in the fitment of a Brush generator and traction motors, in place of the Crompton Parkinson equipment fitted to the Class 45. Along with the other Sulzer class 44 and 45 designs they are often referred to as "Peaks", so named because the earliest of the Class 44 were named after mountains.

Operation

Despite intermittent use on freight trains, Class 46s were regular performers on passenger turns, particularly North East-South West, Trans-Pennine and secondary North East-London trains, and depot allocations reflected this with locos at Gateshead, Cardiff and Plymouth in 1977 giving a typical spread. Freight workings were also quite often worked over long distances, particularly "clay hoods" carrying china clay from Cornwall to the area around Stoke-on-Trent.

In the 1980s the remaining locomotives were concentrated at Gateshead depot, and the final booked passenger workings for the class were the dated summer Saturday services Bradford - Weymouth (between Bradford and Birmingham New Street), Newcastle - Plymouth, Newcastle - Blackpool North, and York - Blackpool North.

Nuclear flask crash test

File:Old Dalby nuclear flask test-by-Brian-Robert-Marshall.jpg

The test at Old Dalby

On 17 July 1984, 46009, hauling three Mark 1 coaches, was deliberately crashed into a "Flatrol" wagon loaded with a nuclear waste flask and lying on its side. The train was travelling at about 100 mph (160 km/h) on the Old Dalby Test Track in a test organised by the CEGB. The test was intended to demonstrate to the public that there would be no leak of radioactive material in the event of a rail accident involving a train carrying a nuclear waste flask.

46009 was scrapped on site at Old Dalby later the same month by Vic Berry of Leicester. Images

Preservation

Three have been preserved: 46010 at the Great Central Railway; 46035 Ixion; and D182 at Midland Railway - Butterley

Gallery

46037 at Manchester Victoria (1983) 46037 at Manchester Victoria (1983)  46045 at Walsden (1983) 46045 at Walsden (1983)  Preserved loco D182 at Grosmont (May 2008) Preserved loco D182 at Grosmont (May 2008)

External links

• Railblue.com A list of fleet numbers with dates withdrawn.