This shed idea is great! 
For the trams and single unit commuter trains, a small station can be used: The train comes to the station, and goes back.
Maybe using just one wagon/trailer with that special coupler (like on the trains with powered tenders) would be OK.

For the trams and single unit commuter trains, a small station can be used: The train comes to the station, and goes back.
Maybe using just one wagon/trailer with that special coupler (like on the trains with powered tenders) would be OK.
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