Actually last time I was there they WERE using the double station.
The double station gives them the advantage that effectively you have two-train operation even with three trains:
Left Station / Lift / Course / Back brakes
Right Station / Lift / Course / Back brakes
Now, this begs the question of what happens if/when the switching mechanism freezes mid-changeover. If that happens, then train-on-course (if there is one) will have to stop at the back brakes. Oops. ;)
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--Greg
http://www.pobox.com/~gregleg/