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I’m using steel rail and PCB sleepers; layout lives in my study. Sydney climate can be humid but generally pretty pleasant (I live in shorts and tee shirts all year round when not working) and not much temperature change in the study. At times I’ll do some testing and short wheel base wagons (as layout set early LMS days almost all stock is either 9′ or 10′) derail; when checked gauge is under? Doesn’t tend to happen at points?