Platforms 6 and 7 at Inverness serve only one track, but I'm not sure if both are still in use these days.
Quite a tricky one, Inverness Platform 7 has a separate line on the opposite side of the platform to the Platform 6 line, although the Platform 6 bay is only wide enough for one line - and the doors for a train on Platform 6 are only released on the other side (opposite Platform 5).