FWIW. MTH's ALP46 used to be rated o54 on its original release some years ago. Also, though I wouldn't recommend for a permanent layout, the ALP46 can negotiate and run on o54 tubular smoothly and even o48 Fastrack. The trucks rotate just fine. I tried this "just to see" and I was pleasantly surprised. The absolute minimum diameter curve it'll run on is o60 FT on my next running layout to be safe.
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