ok, to try and resolve the problem with this tunnel, I built two more tunnels (so there are now two tunnels in each direction), however I have tried various signaling layouts and I can’t seem to get seem to get the trains to use the new tunnels, if there is already a train in one of the two tunnels in a given direction, the second train will not enter either tunnel and will just wait at the portal. Is there anyway to get the trains to use the other parallel tunnel if the first one is in use?? Many thanks, lee.