[brian51]

Pierre,

I would like to thank you for your informative subway posting. it was a most interesting read...

I just wanted to add a comment here to your segment of intersecting subway tubes, where you also provided an interesting pic-

1. It is essentially a 'flat' implementation, that is, there is a single underground level for all subway tunnels. This means that intersecting tunnels cross each other 'at grade'. This, in turn, means that the intersection of tracks is the same as that of intersecting GLR tracks with a 'grand union' layout at the intersection, allowing to go to 3 directions (straight, left and right). Then, when we see this in the underground view:

There is however an exception or an alternative to this that few players know about...
Part of the ESURE mod does supply something for players called " express subways"
Where a player can use a special TE piece ( i forget whether you sue a FURL or SURC to implement this )..
But what it does is allow you to avoid any turns at intersecting subway tubes and all the player to just go in the intended "straight" direction

Perhaps this is an option is something we can research further , since I have seldom used this subway option in the past ?