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Alstom Transport uses technology similar to that of hydrogen fuel cell automobiles. Railway Gazette reports that German rail authorities hope to develop Zero Emission Trains by purchasing fuel cell trainsets.
Oct 6, 2014   Railway Gazette
More capacity for the same cost is the case with double-decker commuter cars -- if they can fit into tunnels, that is. Bi-level train were once more common in the commuter trains serving NYC. However, these cars can have their own disadvantages.
Aug 20, 2010   The New York Times - N.Y/Region
The Federal Railroad Administration does not allow for the mixing of train types for safety reasons, which proved a key obstacle for Caltrain's plan for electrification. As a pilot project,they are allowing the line to utilize electric multiple units
May 30, 2010   Mercury News via Palo Alto Daily News