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<P>How many RRs have built trenches ala the UP (ex-SP) trench going through the inner suburbs of LA, or the one that was built through the downtown of Reno after the UP took over the line? This may seem like a naive question, but isn't it quite easy for rainwater or other things to build up there? What are the acknowledged advantages and disadvantages of building trenches? Would running a trench, for example, be as risky as having a busy mainline running at street-level (I'm talking about something like Stockton, CA, where the RR actually runs on the street, I believe, as well as not having its own trench?) One that would come to my mind is that it would be quite difficult for RR personnel to get emergency equipment into/out of said trench if a derailment or accident happened in one. Although I don't know for sure, my hunch is that not too many have been built, b/c I haven't read or seen about too many around the US.....</P> <P>Riprap</P>
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