Mentioned on another thread that mystery tours occasionally used "freight-only" lines made me think and want to ask the experts (ie you!) > > Is there such a thing as "freight-only lines"; as in passenger trains wouldn't be allowed to use them should they need (ie tours/diversions), maybe for safety/signalling issues? If so, how much in % terms is the railway freight-only? Sorry if all this is in another thread but "search" doesn't bring this up. Thanks!