Why does the track have double lining?

shinkansen SG

The outer rails are the the running rails, the inner rails the guard rails. Trains run on the running rail. The guard rail is something like kerbs on the road side, stops the train from falling off, but normally does not serve a purpose. At crossovers, the guard rails ends. Trains run on third rail, 750 volts DC if I'm not mistaken. Motors are mounted on the train bogies of the 4 carraiges in the middle. The outer 2 carraiges are "driving trailers": They do not have motors. C830s running on the Circle Line uses a different signalling system, thus, they can not pratically run the NS/EW Lines. There are other factors like differing loading gauge.

Yes u are correct. btw the gauge is all the same for all the MRT lines. All uses the standard gauge of 1435mm (4ft 8 1/2in).

http://en.wikipedia.org/wiki/Alstom_Metropolis_C830 (Alstom Trainset - Circle Line)

http://en.wikipedia.org/wiki/Alstom_Metropolis_C751A (Alstom Trainset - NE Line)

http://en.wikipedia.org/wiki/Kawasaki_Heavy_Industries_%26_Nippon_Sharyo_C751B (Kawasaki Trainset - EW and NS Line)

http://en.wikipedia.org/wiki/Siemens_C651 (Siemens Trainset - EW and NS Line)

List of rail gauges:

http://en.wikipedia.org/wiki/List_of_rail_gauges

joeyfjj SG

Yes u are correct. btw the gauge is all the same for all the MRT lines. All uses the standard gauge of 1435mm (4ft 8 1/2in).

I'm taking about the loading gauge.

A loading gauge defines the maximum height and width for railway vehicles and their loads to ensure safe passage through bridges, tunnels and other structures.
-http://en.wikipedia.org/wiki/Loading_gauge

joeyfjj SG

just to ask about trains too, in circle and NE lines, when u head to the front or rear carriage, you see that there is ‘dangling’ cable lines on the ceiling outside the train. does the train actually hook onto these ‘dangling’ cables for power?

http://en.wikipedia.org/wiki/Pantograph_(rail)

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