Hello, i have an existing map i've been playing a few days, many mods including bobs etc, installed your Rail Bridge mod just now and got this error on load of game.
https://www.dropbox.com/s/51miifg4fiq5zcq/
thanks and good luck.

if ya just upgraded to .56 they hard coded bounding boxes for rails.

Yeah, if it's possible, Rail Bridges needs to be marked as incompatible with versions of Factorio above 0.17.55. I don't think there's any way to fix the problem.

Thanks for the report, the migration is fixed in the next version.

Why they make the rail bounding boxes un-moddable ? 😢