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cars turned to return northbound
ID: 14328A
ID: 2025031003
#176 (Thompson lists holdings at the American Geographical Society
ID: 2022092201
BTC Report 09 1903 Plate 07: East Boston Tunnel, Lower Air Locks Step 2: Frame Option:Custom/Archival: Black Stepped cars turned to return northboundDate: March 17, 1903 Subject: East Boston Tunnel (Now MBTA Blue Line) Publisher: Boston Transit Commission Type(s): Photograph, Print Size: 9. 25" wide x 6" high ID: BIT17261 Collection: WardMaps LLC Atlas: Boston Transit Commission Annual Report 09 1903 Boston in Transit Book Figure 5. 14 Tunnel Air Locks, March 17, 1903 A pair of air locks protected the high pressure area of tunnel excavation from the East Boston side of the project. A second level
