Well I have dug a 20m deep trench and put all my lines in there.....
That's good except I need a suitable covering, any suggestions?
Buildings and bridges seem to work...
They did it in Berlin that way but they dug a much deeper hole in 2000.
The good old cut and cover method, which was pioneered in London and then used in Boston when the city built the first subway system in North America.
I've used concrete splines to cover up the ditch, but only for a short distance. I used one of those track-only tunnels that didn't have an end on it, and placed scenery-type tunnel portal entrances. This was way before there was a layer system and the process was very time consuming even for the tiny loop that I put in. The problem I ran into was buildings sinking down under the concrete splines and lots of stuff needing adjustment. If I were building only a subway system, I wouldn't bother with much detail above ground, or even bother with the tunnel entrance, and build the system much like the U-bahn system by MCQ is done.
There are some subway assets on the DLS. They are really, really old, but still work okay and there are others.
<kuid:58843:38045> Subway track 1 line L
<kuid:58843:1040> Subway no 3rd rail cement 2
<kuid:58843:38041> Subway track 1 line
<kuid:58843:38039> Subway track 1 line NC
<kuid:58843:38044> Subway track 1 line R
<kuid:58843:38046> Subway track 1 line 1 side
<kuid:58843:38043> Subway track 1 line-gap
<kuid:58843:38042> Subway track 1 line-walls
<kuid:58843:38040> Subway track 1 line-walls NC
<kuid:58843:38103> Subway Platform
<kuid2:58843:3335:1> Subway Station 4
<kuid:58843:48106> Subway Island Platform Start
<kuid:58843:38114> Subway Platform 4 local
<kuid2:58843:39202:1> Light Spline
<kuid:58843:48104> Subway Platform Start
<kuid:58843:38120> Subway Island Platform
<kuid:58843:48107> Subway Island Platform End
<kuid:58843:3334> Subway Island Station
<kuid:58843:3333> Subway Station
<kuid:58843:3336> Subway Station 4 Local
<kuid:58843:48105> Subway Platform End
<kuid:58843:38106> Subway Platform Exit
<kuid:58843:38119> Subway Platform Terminal
<kuid:58843:38116> Subway Platform 4
<kuid:58843:38109> Subway Platform 4 end
<kuid:58843:38117> Subway Platform 4 local end
<kuid:58843:38115> Subway Platform 4 local start
<kuid:58843:1038> Subway Platform 4 local-3
<kuid:58843:38110> Subway Platform 4 start
<kuid:58843:38118> Subway Platform 4 terminal
<kuid:58843:38107> Subway Platform-2
<kuid:58843:1036> Subway Platform-3
<kuid:58843:1037> Subway Platform-4
It's interesting seeing a 14-year old thread come alive again!