File:SASPhase1TBMBreakthrough.jpg
Summary
Workers completed tunneling for the first phase of the <a href="https://en.wikipedia.org/wiki/Second_Avenue_Subway" class="extiw" title="w:Second Avenue Subway">Second Avenue Subway</a> on Sept. 22, 2011, when the project's tunnel boring machine reached the <a href="https://en.wikipedia.org/wiki/BMT_63rd_Street_Line" class="extiw" title="w:BMT 63rd Street Line">BMT 63rd Street Line</a>, breaking into the <a href="https://en.wikipedia.org/wiki/New_York_City_Subway" class="extiw" title="w:New York City Subway">existing subway system</a>. The 485-ton, 450-foot-long TBM used a 22-foot diameter cutterhead to mine 7,789 linear feet in two tunnels, averaging approximately 60 linear feet a day.
Licensing
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 02:57, 6 January 2017 | | 2,400 × 1,594 (3.83 MB) | 127.0.0.1 (talk) | Workers completed tunneling for the first phase of the <a href="https://en.wikipedia.org/wiki/Second_Avenue_Subway" class="extiw" title="w:Second Avenue Subway">Second Avenue Subway</a> on Sept. 22, 2011, when the project's tunnel boring machine reached the <a href="https://en.wikipedia.org/wiki/BMT_63rd_Street_Line" class="extiw" title="w:BMT 63rd Street Line">BMT 63rd Street Line</a>, breaking into the <a href="https://en.wikipedia.org/wiki/New_York_City_Subway" class="extiw" title="w:New York City Subway">existing subway system</a>. The 485-ton, 450-foot-long TBM used a 22-foot diameter cutterhead to mine 7,789 linear feet in two tunnels, averaging approximately 60 linear feet a day. |
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