When you say improving existing routes can you get rid of all of these entry portals and exit portals and replace them with terminus stations. having portals is a bit unrealistic.
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While playing DRS I realised that it would be great to have a fully accesible cab. What I mean by that is maybe if you could control the train's wipers and if the trains had destination blinds showing where the train was going. Also, it would be great if the trains had lights at each end and that these could be controlled from the cab.