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[quote]QUOTE: Originally posted by daveklepper In a lot of cases single track lines exist on what were double-track rights-of-way (either prepared for double and never installed or removed during downsizing), and double-tracking existing lines may be the answer. [/quote] Excellant point. I am often impressed to see relics of instances where forward thinking railroads secured the right of way needed and made preliminary preparations for future expansion. Often as long as a hundred years ago. We have a number of bridges here that despite being dual track, one can see that the builder designed the abutments to be ready made to accept additional parallel spans. And I suspect that preexisting infastructure such as that, weighs into the decision on which routes will be kept, and which are expendable.
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