#4: Could this at least be optional? While reversing trains may not be realistic, it saves us from having to build a turning-loop in the game.
#5: If the game-settings are divided into Easy/Medium/Hard/Custom where all but custom use pre-defined settings for the individual difficulty settings, ‘main-connection’ should not be active in ‘easy’, but active in ‘hard’ (not sure about ‘medium’).
#7: If this is added, it should be optional. Sometimes, we may later want to add a switch, and if the switch straddles a segment-boundary, this would make it impossible to add. Perhaps we could just have the ability to divide a large segment into X smaller segments (but there should still be a mimimum segment length in this case).