I have two standard gauge loops - the inner loop has mostly STD 57 with a little STD 72. The outer loop (closest to the wall) has mostly STD 42 with a few STD 57 curves. I run the Ives Olympian train (with 4 cars) without problems on the loop with the sharp curves. The same goes for my AF president's special pulled by a Lionel 392e.
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