One thing that is vital to prevent frog jumping is the spacing of the Guard Rails, AKA Check Rails. The inside of the opposite wheel rides against the Guard Rail and if it does not do it's job the wheel passing through the frog may split the frog. The shape of the flange is also important if it is too deep or too shallow plays a role. Reading the NMRA standards for track and wheels can give you insight though not a direct one for one comparison. j
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