Thanks for the tips blk11. I'll give it a go.

@ FenderBender: Thank you! As far as I'm aware, there are no tutorials for this kind of track laying/maintenance. The only way to smooth out curves is to re-lay the track from scratch using easements for superelevation.
I'd suggest to first fly along the section of route in question and determine where to start re-laying and where to finish (and in which direction to do it). Always document the gradient profile of the original section before deleting it!
Try to avoid situations where you'd have to join up a superelevated curve from different directions - if there's no other way, do it like this: bring the tracks from both directions into the middle as closely to one another as possible, then deactivate 'easements' before linking both sections up with a third piece of track. Pay close attention to the differences in curve radius between the 'bridge' and adjoining pieces of track for a smooth ride.
I hope that helps!

You've done a brilliant job on the tracks, smoothing out some ridiculous curve-straight-curve sections. Thanks for sharing!
I'm trying to learn how to do the same thing on another couple of routes I've purchased recently. Can you give any advice on where to look for tutorials on 'track maintenance' please? Particularly on how to do the smoothing of the curves, and especially when the two ends of the curve are on different levels! Any guidance would be massivley appreciated. Thanks.

@ Supplanter28: Thank you very much! Issue has been noted and will be fixed in the next update.

Brilliant work. I thoroughly enjoyed the run with the Scenario you created for this.
Just after Mossley there is a section of track that causing a speeding penalty as apparently it's 15mph. it's literally only a little secion which isn't even coming up on the Hud to say it's 15mph. other than that fantastic job.