Dashster, a tip of derailing. The pilots of a few steam locos started regularly derailing on a 20+year old Gargraves 100" switch. I found that the front wheels of one of the locos had spread apart slightly, but I also found that the years of heavy steam locos pound that switch had affected its gauge, causing the outside rails to come slightly closer together, forcing the pilot to derail on the frog, notwithstanding the presence of the guard rail. Lightly bending the rail completely cured derailing. I used a micrometer and found the rail had shifted 1 or 2 mm.
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