Place SFM in its own folder within your MSTS or Open Rails directory for easy pathing.
Old shapes often have transparent windows that show the sky through the cab. SFM can modify the Z- write alpha settings to fix this. msts shape file manager 25 best
Some old models have a dummy [internal] reference that causes a crash. SFM lets you delete the entire internal section via the Edit -> Delete Selected menu. Place SFM in its own folder within your