justalurker66 wrote:More than two tracks comes in handy when there are stations with express/local service. Otherwise just schedule the trains so they run as close as the signaling will let them. Without stations everything runs express. The main benefit of a third main would be when a track was taken out of service for a repair or a train stalled that needed passing. The extra capacity of a third main just may not be worth the millions it would cost to put in place.
I would agree if things were to stay status que, however... branch trains already stop at Gresham, some at 47th Street for employees. Add Auburn Park and 35th Street to that, along with additional revenue/yard moves that would come from SWS/SES and a third main may be feasible. Of course that all depends on the service levels Metra decides to give 35th Street and Auburn Park, and the number of trains that would possibly run on SES.
It may be worth pointing out that the new signal bridge installed on the north end of Gresham Jct. appears to be able to accomidate a 3rd main to the west. The same goes with the new interlocking installed last year north of Gresham. There is also enough room within the interlocking for additional switches to a new main. Video of the new interlocking can be seen
here at about 3:30 in.
Little help from MS paint:

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