aha i see,

Thank you people!
it works like a charm now.

Hi guys n gals.

Not sure if this sort of thread has already been made but i need help with installing a mod, every time i follow a tutorial video on how to do it, it crashed my game on start up with a windows error message.

Filename of mod
C:/Users\Duncan\AppData\Roaming\Factorio\mods\rail-layer ...