1. Own Bakerloo 2. Spawn in 2021 timetable mode on foot at Harrow & Wealdstone 3. Go to the platform edge facing the OHLE lines, the invisible wall will stop you 4. Spawn a class 66 or diesel of your choice 5. Open the door of the loco and enter the cab 6. Exit the cab on the other side You now have access to the mainline in whatever loco you like, and since the mainline follows the tube track fairly closely you won't get the out of bounds message until you get past Queen's Park The amount of modelling of both track and scenery away from the tube tracks is astounding, there's an insane amount of rolling stock sitting idle (including 66s) at the various depots/facilities, including a rake of parcel vans I dragged along the mainline for a laugh The only downside is reds and you can't set a route, but that's easily worked around by driving on the wrong track, cough (ie driving up on the downline, or whichever way around it is)
Interesting, use the 66 as a tunnel through the invisible wall. Will try that, thanks Fred! Got stopped by a red signal soon though.... anyone notice how the gauge lights look better on ToDv3...