To clarify for anyone who may be getting confused the SMA does indeed reach Edinburgh but only via Bathgate. The 380s used east of Edinburgh arrive on services from Glasgow, some of which start back from Ayr, via Carstairs, a route not covered by the SMA. Indeed before the roll-out of GSM-R only a sub-fleet of 380s (101-108 rings a bell) could operate such services; the 380s were built with a view to DOO so were fitted with the requisite CSR for this but only the aforementioned sub-fleet also had NRN allowing them to work away from the DOO area. Of course all mainline traction is now fitted with GSM-R so the need to separately diagram a sub-fleet of 380s should no longer exist, assuming all 380s have guard-operable door control panels.
A quick check of a rail atlas will allow anyone to confirm that the route from Ayr to Glasgow has no practical connection to allow through operation via Bathgate.
