This is the 1913 Map showing how theĀ rapid transit lines will look after completion in accordance with the Dual Contracts. Note two unfinished BMT lines that were proposed in the contracts but never finalized: The BMT Crosstown Elevated, which was later built as today’s “G” line Subway (although not exactly along the same route). Also note that the Flushing line was not supposed to terminate at Main Street but was supposed to continue to the East.
Click here for a high resolution .pdf version

Before the BMT
Brooklyn Rapid Transit System Before the Dual Contracts
Service Guides
If you are interested in the service history of the BMT from 1923-1940, including virtually all maps issued by the company, purchase our book:
https://www.createspace.com/3677153
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Contract Drawings
Contract Drawings for the Astoria Line
Be patient – these are huge (over 100 meg) pdf files and take a while to load
Contract Drawings for the Jamaica Line
Contract Drawings for Stillwell Ave – Coney Island
Line Drawings
Single line Drawings of the Astoria and Flushing lines
For an explanation of how to read these go to this page on NYCSubway.org. It contains an excellent explanation
Track Maps
1930′s BMT Southern Division Track Map
1964-1966 Broadway BMT (Manhattan) Track and Signal Maps
1965 Nassau Loop Tracks and Signals