In order to facilitate the storage of stock off-scene and to provide the layout with a suitable method of getting things on-scene, this version of the layout uses a Traverser.
In this case I have used a Grainge and Hodder laser-cut traverser of 1400mm in length, though I went through the process of creating one from parts in a previous layout build:
Example Traverser Operation
The length of this traverser is realistically as large as I could make it while staying in proportion to the rest of the layout, but should offer the option to perform the following sequence of moves per road:
Trains are top-and-tailed by locomotives, and depart in the down direction. The Down engine uncouples and a pilot moves the carriages to another platform road, then a light engine facing the Up direction backs down from a theoretical MPD onto the coaches, and forms an Up train. The Down engine then leaves light-engine back to the MPD for turning, but in fact as can be seen simply couples up to the train in the traverser and the process can begin again.
One would interleave a series of these movements together to make it less obvious, and with a six road traverser (one road always staying clear for shunting moves), you can have quite a few movements before things start to double up without any other variety being introduced.
Tweaking
No engineering of this kind is flawless first time, so I retrofitted these end-cap jigs to keep the rail heights consistent
An example of where this is valuable is shown below, where the rails are not jigged:
Interlocking 
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