On West Cornwall Local the Class 37 is given 6 services by default, however if you have the correct trains/routes the number of class 37 services jumps to 21 which includes passenger services and ecs services. What train/route do you need to get access to the extra class 37 layers. A reply will be appreciated. (I don't have wcl yet so I don't know if I have the right routes for it).
Sorry I forgot to say that you do also need the heavy freight pack for Northern trans-pennine as well. Sorry not to have made this clear originally.