Thurso has a second track, but there isn't actually any platform there - just the wall of the shed.Thurso has somewhat of a platform 2, although right at the far top and would probably not fit a 158 (the track is very rusty and clearly not used much but it does have a signal at the end)
Unless you mean the one on the other side of the platform, but that has a fence against its platform edge...
The main one I'd nominate for this thread (and I don't *think* anybody has) is Inverness P7. If they do use it, good luck on any passengers actually finding it...