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ping: train experts

D

deanx0r

Senior member
What is the purpose of the third rail displayed in these pictures below (which is the RTD light rail train system of Denver, CO)?
I doubt they supply electricity as there are overhead wires on those tracks. After the recent blizzard, I've noticed that those third rails were still covered by snow, leaving me to believe they aren't in contact with the trains.

It's not a dual-gauge railway either as this third rail only seem to exist within the boundaries of certain station (couple hundred yards at most). There isn't any third rail in the stations located downtown.

Any ideas?

http://anh.bi.home.comcast.net/lightrail01.jpg

http://anh.bi.home.comcast.net/lightrail03.jpg
 
In case of derailment, the third rail catches a derailing wheel and does not let it run into the platform full of people.
 
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