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www.nycsubway.org: The New York Subway: Chapter 06, Electrical
Real-Time Transit Maps on Circuit Boards – The Map Room
Traintrackr is a light-up circuit-board map of the London Underground
An MTA Video Explores Technology That Will Revolutionize Its 100-Year
Con Ed to overhaul subway power distribution | Crain's New York Business
NYC subway bosses admit they don't know where the trains are because of
NYC subways slowly upgrading from 1930s-era technology | Daily Mail Online
Stock photo: Subway train control panel | MaximImages | Image #MXI26223
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