Thanks for contacting us. It would appear there may be a bug in RailClone where the Z box mapping is not being calculated correctly. We'll look into this and issue a fix as soon as possible. Until then, the workaround shown in the attached file forces UVs to work correctly, but be aware that styles made with this technique may not work once we issue a patch to fix the problem.
Thanks again and apologies for any inconvenience this has caused.