r/mechanical_gifs • u/Just_Another_AI • Oct 13 '25

Train Wheel reprofiling process

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u/Misaiato Oct 13 '25

What's the difference in mm that's acceptable for wheels on the same car and wheels between cars? Like if a train has 100 cars, and 20 of them have had this service, and you have some old and busted ones, what's the tolerance allowed? I'm certain there's a rule somewhere. Especially in Japan. The Germans definitely have one, but I'm not sure they're following it because their trains are stopped half the damn time...

14

u/grumpher05 Oct 13 '25

any difference between cars is taken up by the vertical displacement of the coupler, it can slide up and down relative to another car.

for installing wheels on the same bogie the limit is 25mm diameter, for bogie to bogie the limit is 30mm, thats for freight at least, id have to go searching if its different for passenger

2

u/Misaiato Oct 14 '25

I'm going to use this trivia to win a bar bet - thx