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Old 08-15-2018, 03:31 PM   #10
David Harrison
Senior Member
Join Date: May 2009
Posts: 327

Originally Posted by miningcamper1 View Post
I always cringe when I see an unprotected third rail- just outrageously dangerous IMO.
And whatever is that fourth rail for?
CTA and Boston both use the unprotected third rail. The fourth rail is a guard rail, placed within the track it helped keep any derailed truck from leaving the track structure. It also is grounded and is used to carry the electrical current back to the generating station. On elevated track there are two guard rails. Also there are two timber guard blocks placed outside of the running rails. Note the safety trip used by the flagger and its position net to the third rail.

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Mberry, I agree about the cropping. SARConnecta, I see it coming too. Thanks all.

Last edited by David Harrison; 08-15-2018 at 10:00 PM.
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