So, returning to the grand plan - the intent for the lower level is currently a loop of track within the shed, with storage sidings under the passenger terminal. This allows locos to be run continuously for the purposes of running in, and offers storage. The dock side of the oval will be double track, the hidden side, ideally I should be able to get 4 or 5 tracks in. I have found that placing turnouts (or worse, crossovers) on curves is very difficult, and takes up far more space than might be at first imagined, particularly if one is trying to maintain 2m minimum main line radius (or even a bit more).
I am looking through my books to try to understand the layout of goods yards - it seems to me that one needs a reception road sufficiently bigger than the largest train, probably parallel with the long side of the oval, with some means of loco release, and a headshunt allowing the shunting locos to access the stock and distribute it around the docks. A lot of sidings seems to be a common feature, but I really don't want to overcrowd it. Some more work on screen required before committing myself.
Another, key point, is uncoupling. I use 3-links or screw couplings on everything, except within rakes of coaches where I use Kadees. Three-links mean the hand-of-god (attached to the arm of Simon and holding the holy uncoupler of Damascus) has to be able to reach - practically this is not more than 750mm / 2'6 dependent on the height of the baseboard - that limits the number of tracks from the furthest where uncoupling is envisaged to the edge of the board. Higher baseboards probably means the furthest track needs to be nearer.
Work in progress - the lower level - Entry/exit to the outside lines to right. Double track with crossover top centre. Outer track at left becomes the ramp to the upper level. I'm trying to make some sense of the pointwork top right - the three roads in the upper middle are reception and departure, the two below are "dockside". The curves top right will connect to the storage sidings bottom centre.
and the upper layer for the passenger terminal. Both upper and lower level exit the shed on the east.
The spur to the bottom of the trackplan connects to the ramp track which is the lowest line in the upper image.
The spur to the upper centre will lead to the loco shed. It is "based on" Birkenhead Woodside though I have taken a few liberties...
The plan is such that (once I have constructed the hidden sidings) it is reasonably easy to build it in stages and thus develop it piecemeal.
The outdoor track will all be Peco as it is robust and standardised - if a point or crossing is damaged, the replacement would be drop-in. As you will gather, I am planning to use Templot for the indoor track. I have done the loco shed in C&L chairs and wooden sleepers/timbers and that was quite enjoyable. I would like to use the 3D printed track but I am still on a learning curve, and have yet to complete my first turnout, but I have printed a couple of reasonable track bases, so it will happen. Still two double slips in the passenger terminus and maybe three in the dock...
Early days, need to build the shed first!
Simon