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Re: Signals going up soon on Mt.C. sub
Posted by D.M. Mitzel on 2/8/2017, 10:25 pm, in reply to "Re: Signals going up soon on Mt.C. sub"
Not sure about PTC raising the cost of a mainline switch to that degree, unless it's in dark territory. The normal track shunt device you see at a hand-throw switch in CTC territory _should_ be sufficient as PTC is a non-vital overlay there. This means shunting the circuit at the switch would drop the signals to restricting, and the PTC system would enforce a restricted-speed condition on all trains approaching and in the block.
Dark territory is another story, as a WIU (wayside interface unit) would be required at the switch, with the appropriate antenna installation to "talk" to the onboard PTC computer and back office. I can see the additions there would cost quite a bit of $$$$. This may have made installing CTC on the Mt. Clemens Sub a straightforward decision on CN's part... saves all those extra WIU's outside the normal control points and block boundaries.
Dan In Oxford (but Houston, TX this week... this travel is getting old)
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