I've knocked this up today. Took a while to get that subtle curve in, AnyRail doesn't provide any tools for quickly doing curved shapes so shape control points have to be added and aligned by hand:
Note that, in the fiction, the 'goods yard' is a late addition to allow reworking the demonstration freights away from the main station of Tynworth. In the fiction's original idea there would have been no freight sidings for the railway as the station was for boat trains only, and the port handled all the freight. However, with the 'rebuild' of the port to use its western entrance for bigger ships, and all but close the eastern entrance (where this station is), this land was used for general storage of port equipment. The land was returned to railway use when the heritage line was able to afford the re-opening, and there was seen to be a significant tourist revenue to be had for people visiting The Pen (the large island of rock at the harbour's mouth).
Note that I've attempted to add appropriate signalling, but I'm in no way sure it's right.
Edited by Ian J.