LBR Mainlines
From #openttdcoop wiki
LBR Mainlines
LBR Mainlines are arranged in a 3x1 configuration, of:
Left | Bidirectional | Right
Current stage: Development - Building first live test track
Notes: Takes up less track than an LL_RR mainline and can be compressed more, downgrades to LR more easily where needed, more complex signalling
'Minimum width: 5 tiles: Primarily (L__B__R), Connectors (L_L_R_R)