Regarding 158 route clearance, at one time they were banned from the Shotts line, between Holytown Jc and Midcalder Jc. We (Control) enquired why and were told it was because, at a couple of stations, with the air suspension deflated, the opened doors might scrape the platform. Obviously the issue was addressed as, before electrification, the class became regular traction on the route. It could therefore be similar minor issues preventing their clearance for other routes, or even just the fact that the routes have not been cleared because there have never been any plans to operate them there.