Earlier today I was following the progress of the 1T98 0845 Inverness - Glasgow QS (because someone I knew was travelling on it) and I was intrigued to see that from Stirling, instead of taking what I would regard as the "normal" route (via Croy, Lenzie and Bishopbriggs), it took an alternative route from Greenhill Lower via Cumbernauld and Springburn. This was a slower option (43 minutes) than the first (32 minutes) according to the WTT for that train and the following Aberdeen - Glasgow QS service, which left Stirling 15 minutes after the Inverness train, but arrived in Glasgow just 4 minutes later. Does anyone know if this was a one-off, or whether this "diversion" has been in use for some time? It seems perverse when the operator is constantly trying to shave a few minutes off journey times by cutting intermediate stops at lightly-used stations to deliberately add 11 minutes by using a "scenic route". I can of course see that diverting at Greenhill Lower avoids path conflict with Edinbugh-Glasgow services at Greenhill, and perhaps it's just a simple matter of "not enough paths".