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Isn't there a points indicator with associated route indicator when leaving the loop northwards? That'll confirm to the Driver that the facing points are detected in the correct position, once he's pressed the appropriate plunger. There'll be no indication to the Signalman at Inverness.
There's an alphanumeric route indicator above each of the Down direction stop boards, showing either "M" (Main) for Wick/Thurso or "B" (Branch) for Kyle of Lochalsh.
The signalman at Inverness has no indication as to which way the points are set.
Similar arrangements are found at Georgemas Junction and Crianlarich.