Posted 16 August 2017 - 07:56 AM
Who told you third rail is cheaper? Besides the fact that Thirdrail would be most offended , that is actually not true for mainline electrification in this century. That is why no one does it unless they are forced to by some other factors.
Making all locos dual mode is lunacy. Carrying around the extra weight and incurring the extra cost of acquisition and maintenance on all locos so that they can run 3 miles on the other mode out of their 200 to 2,000 mile run is crazy. It is easier and more cost effective to put in all the duct work and exhaust fans necessary to suck out all fumes form the train shed.
Do you know why the LIRR and Metro-North predominantly chose third rail? It seems odd that they are the only commuter rail operators in the US to use it. Also, why do almost all rapid transit railroads use it? Is third rail more efficient when high speeds are not achieved (such as on rapid transit lines)?
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