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Multiple tracks tend to be expensive to maintain. One of the things that happened to multiple track railroads was the change from ABS to CTC systems. A lot of multiple track was ABS IE all that was there was a signal system to try to keep trains from smacking into each other.      Also much of that (ABS) was only signaled in the direction of travel. ie the on a 2 track railroad the north track was west bound the south track was east bound. Kind of like a 2 lane road. Having a signal installation also increases costs.      If you had a railroad that had enough business to have multiple tracks you also unually had a railroad that needed a signal system. When CTC came out it was cheaper to install CTC and  change to a single track the railroad.         I would suspect that CTC installation came with single tracking a lot of double track railroad as I think the ICC would have had to approve all of this.      One of the biggest advantages to railroads that were single tracked with CTC is it is now easier to put the 2nd track back in as the at least the grading is already done.
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