Somehow buiding a new shuttle train (ie. crafting a module and placing it in a locomotive) removes the reach bonus from other mods (Far Reach for example), until the setting of these mods are changed. Do you have an idea about why would this happen?
Sounds strange. Never heared of such a problem. But I have not yet used Far Reach.
To say it clear: I highly doubt that this mod is the issue. There is nothing special around creating and placing the module into a locomotive.