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Good point about the airlocked train stations. I have a thought about that. It would be really simple I think. Have a seal that seals off the passenger platform as the train arrives and departs. Then have two seals at the end of the "tunnel that open and close to permit the train to enter and exit and yet allow the platform to be presurised and depressurised for loading and unloading. It would be a simple system to build I think. James P.S. If you want a sketch, let me know, I will draw one up and email it to you if you wish. James
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