David;
One design goal was to have this fit into the average bedroom or study. The plan is drawn for #4 switches and as Matt mentioned above, O-54 switches should substitute well; O-42s could save you some more space and you might pick up a car length on some of the spurs by using them. The alignment under building 'C' and the alignment in front of buildings 'D' may require some changes to accommodate the actual switches used. Everything should be do-able in 3 rail.
You could possibly use a 4-way switch to lead into the industries in the upper right; but I would keep the existing design for scenic and operational purposes. The track leading under building 'C', which is on stilts, is very prototypical for industrial buildings in the New York area. The curved turnout also lends scenic and prototypical interest. In addition the track arrangement as drawn should maximize the car storage on the tracks beyond as opposed to using a 4-way.
TT
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