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I think the response that you have to change the track polarity either manually with a switch or automatically with a reverser pretty much covered your question. But some replies indicated that there is some construction obstacles that you might want to consider. I also have the Walters 90 footer and when I put mine together a couple of years ago I received excellent advice about some problems to be aware of and solutions that individuals devised so your 90 footer will run well. I made a number of those changes and I am satisfied with it's operation. Ask the forum members and you will get good advice. One problem that I recognized by watching a friends turntable was the speed of rotation. A 12v motor will spin it around like a merry go round. In other words way to fast. I didn't know what speed that it should turn I just knew that 12v was way to fast. If you consider that the first turn table were moved by hand the sure wouldn't go around very fast. When the TT's were later electrified the motors would have had to been geared down be cause they needed torque not speed. Locos were getting ever heavier. The whole speed thing was solved for me when I stopped by a small tourist railroad. They have a turn table and I was able to time the revolution required to make the turn. When I got home I tried a couple of thing and settled on 5 volts. Works good and isn't as noisy. Another thing that helped me was that the turn table operator overshoot his stopping place and had to reverse the power to get it lined up properly. I do it pretty often my self.
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