Quote:
Originally Posted by VancouverOfTheFuture
realistically the railway isn't moving/changing. only the road and electrical can.
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When you can move things into one ROW, what is created is a single point of failure.
The point I was trying to make is that you can put everything in the same ROW, but it doesn't have to be the same structure.
Like you could put freight on a bridge that either turns or flips open, then 80 meters above that you have a fixed bridge that carries the metro, and then 5 meters above that you have the road bridge, and then run hydro's lines insulators 5 meters up and outwards (so a failure doesn't send the lines into the bridge deck before breakers can trip.) You could also do the same with gas or water lines, though there are different difficulties with pumping uphill that don't exist with electrical services.
It's not an advocation to DO that, just that there is nothing physically preventing sharing the ROW, except not wanting to cause multiple service failures due to a single failure in the bridge structure itself. Like you could have Paved road surface on top of the rail ROW reserved for Emergency services or Bus-Bridge support that physically has gates or bollards at each end to keep it from being used as an alternate route.