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The british built railroad track so that the tracks are seperated by the same distance as the wheels of Roman chariots. The Northern US copied the British. in the southern US the distance between the tracks varied. In the civil war Union troups rebuilt the tracks to fit there trains. Ultimately the distance originally determined for Roman chariots became the unnicversal standard. However it is not obvious to me that the ideal seperation for roman chariot wheels would also be the ideal seperation for train tracks.
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Did you follow this match?
http://www.chessdom.com/kramnik-aronian-2012-live/
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I didn't know that until I travelled by train in Russia, and woke up at 3am to find we were changing track widths.
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Trains allowed armies to mve realtively quickly. Russia has a history of being invaded. The need their train track to incompatible with western Europe.
When you changed track widths did the wheels on the train move or did you get off the train and on a new train.
With all the technology the germains developed for world war II why did they not create trains with adjustable wheel seperation so they could have invaded Russia from the inside out?
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I wonder if Russians in their 70's in 1980 would have said the problem was recreated.
I want to see a picture of the underside of a "tramtrain" but could not find one.
Can the wheels of a tramtrain change their seperation?
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It was three am, we stayed on the train and it moved back and forth a lot. I didn't look to see what was happening, bucause it was 3am 
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