The second branch to the north of the station (which in the real Crianlarich would be the Oban branch) is nowhere near completion. This is where I diverge from reality again - it is going to pass over a viaduct where in real life it curves away and down the gradient to the old Callander/Oban line to head west. It is the other branch to Fort William that crosses a viaduct over the main road and the River Fillan. Because of the constraints of size on the track plan, this wouldn't work, so modeller's licence has to be called upon again.
The viaduct will have to curved, it works out at 40" radius and the line behind will, by then, have disappeared, possibly into a low cutting.
I intend to build the viaduct as a separate scenic section to slot in at that point rather than work on it in situ. A plywood base will sit on existing framework and with careful measurement the track bed should 'join up' at each end.
Now a decision. What type of viaduct? In theory I suppose it should be one of the metal girder on masonry pillar structures so typical of the line, but since I have deviated so much from the original, I am tempted to do something different. There is the attractive viaduct at Craigenarden or a smaller version of the concrete viaducts seen on the extension is a possibility. I do very much like the viaduct at Killiecrankie on the Highland Line but even my modeller's licence couldn't justify that.
I am not quite sure which route to go down at the moment. Any ideas?