Just to comment, DX12 isn't officially supported by TSW, due to being a known cause of instabaility. It's the reason DTG never made it's implementation official. It's why I stopped using it during TSW4's run as I used to get crashes with it.
I know it's not officially supported but I use it as I use the Jetwash engine.ini mod (I'm sure DX12 is required for it to work on any of the presets other than the most basic?). Would DX12 cause a specific route/DLC to crash without ever affecting any others? As I say all other DLC within TSW6 is working fine with all mods and edited engine.ini along with screen percentage at 150% and running with DX12. I now realise the only thing left edited when i removed and reset everything else to standard was the DX12 command line entry for TSW6 (My mistake as I forgot it had even been set upon first install) but I am unable to check if this is the cause with this one route now as Steam have responded back and refunded. It's a beautiful looking route and from what I've seen in little bits myself and from others images probably the best TSW has ever seen but if I cannot manage more than 10 minutes on it before TSW crashes I obviously can't warrant having it. The only thing I can think is to wait till the refund has gone through and then purchase it again and run TSW using DX11 to see if that solves the issues with the route on my machine.
The whole door cycle takes around 20-25 seconds (including getting “2” off the guard) The station stops are around 30 seconds or 1 minute at some stations, there should be no issues with keeping time. The only station I lose time on is between New Hythe and Aylesford as I only take power on notch 2 on a single yellow and accelerate to around 30-35 mph before coasting.
Service: 2K10 (2142 London Victoria / (2240 Rochester) to Gillingham. Unit: Class 465 Platform: PC / Steam Weather: Dynamic / using live weather mod Issue: Have to close doors on a red signal at Rochester for departure. Also there is no theatre or route indicator (feather) when routed into Platform 1 at Gillingham, I assume this should have some form of approach control. I can’t remember this issue in SEHS.