However, as soon as you carry out the air phase then the railways show as green, and a railroad repair unit I moved to Finland can't repair them. Selecting rail movement does allow units to be transported by rail. So in that phase it appears that all is well. But when you end the turn and move through the Soviet turn and back to Axis logistics, the same happens.
I might have done something wrong with the modding, but I can't spot it, and suspect the issue is that the logistics AI can't cope with rail that is physically separate from the rest of the rail network. Though I took Prussia and the NSS's there out of the RTL scenario deliberately to test whether it would work if the only rail in the game is in Finland, it doesn't matter.
Of course, this might be WAD, and there is no intention that players should be able to play as Finland with no link to mainland Germany, though I doubt this if we can play as Rumania etc. But my concern then is whether the rail system shuts down if at any time you are cut-off from Germany? Obviously, with a smaller pocket around a port this might not be obvious where trucks are getting supplies from a depot at the port directly and don't need it to be moved first by rail to a closer depot. I haven't tested that.
PS. I will email screenshot and save file, as I'm not yet allowed to attach anything.

