I've altered the plan slightly, rationalising the shed to turntable, coaling / water road and a twin line shed (probably Bachmann diesel unit back-dated)
I've added a passing loop to the nearest line (can't decide if that's up or down, guess it depends which coast it's on!) opposite the shed, platform 3 (may not actually be a platform face given the bays) will double as passing loop and ability to drop a freight for shunting into the goods shed.
The goods shed has two lines in the shed and two goods sidings
The aforementioned bays are partly coach storage for excursions with only one or two actual platform faces.
The fiddle yard arrangement is intended to be able to hold a couple of trains without blocking the continuous run, the centre one of which allows for running round of a local train destined for the bay, the siding being for a DMU.
This bi-directional loop could also be a cassette, allowing for changing of stock.