The idea of a Railhead facility has been around for a while and people have recently been talking about it again. I am going to throw out another idea for handling Rail, but this one doesn’t require a new kind of facility and should not allow rail movement to get ridiculous and upset the game.
Rail movement between Industrial Complexes.
It is assumed that rail networks exist in industrially developed regions and that these rail networks may be used to transport ground units. During Noncombat Movement phase, units in a territory with an Industrial Complex may move to another territory that also has an Industrial Complex and that is no more than two territories away. Both territories with ICs, and a territory that is connected to both of them, must have been controlled since the start of the turn by the same side, but not not necessarily by the same power. For example, Infantry units could be moved from the IC in Russia to the IC in South Ukraine if Bryansk is allies controlled, but they could not move not to Novgorod because it is 3 territories away.
The number of units that can use this special rail movement is equal to the number of units that could be mobilized at either IC. For example, 3 units could be moved from Russia to South Ukraine if both ICs are undamaged, but only 2 units could be moved if the South Ukraine IC has 1 damage point or the Russia IC has 8 damage points.
Implications:
An IC in Romania would be useful for Germany because they could move artillery units to the Southern front quickly by rail and match them up with mechanized infantry. Likewise, USSR could move units Westward in similar fashion following a sea lion, potentially advancing up to 6 units by rail with an IC built in North Ukraine.
In either case, strategic bombing of ICs potentially reduces both production and rail movement if the SBR damage is not repaired.