Cannot construct underground rail in multiplayer

[moblet]

Am finding in multiplayer that I can't build rail lines underground as I can in single player. The only underground rail line construction I have been able to do is build a default straight line tunnel. Am I doing something wrong or is this functionality not operable in multiplayer?

[Dwachs]

There is no preview for underground ways in online mode (ie click-and-drag). But you should be able to build straight underground ways (by two clicks).

[moblet]

Ah, magic. Thanks!

[jamespetts]

Are there any plans to add click and drag for underground ways and elevated ways in multiplayer mode? It makes a truly enormous difference to usability.

[Dwachs]

afaict: no. should not be impossible to implement though.

[jamespetts]

Might I suggest, in that case, that such a feature be implemented? It really does help a great deal to be able to use click and drag mode.

[Dwachs]

just another case of DIY. volunteers wanted 

[moblet]

Could this feature have been deliberately omitted because of the potential conflict if two players tried to build in the same place at the same time?

[Dwachs]

Yes exactly. Tunnel/elevated way tiles would collide with preview tiles -> building fails on the client that has preview image tiles on places, where tunnel/elevated way should be constructed.