I have a query about different gauged trains operating on a single track dual gauge branch line which terminates in two dual gauge sidings with a dual gauge run around loop. For background, the standard gauge trains are captive to the line, whilst the narrow gauge can crossover to narrow gauge track at some points along the route and have a number of sidings of their own at the terminus.
My query is what are the protocols, limitations and restrictions for operating standard gauge on the line. It would seem to me that if a standard gauge train breaks down on the line it limits most traffic and the operating authority would try to limit the frequency and access for standard gauge trains to the branch line. It also seems somewhat bizarre that both gauges share the same sidings, which would again limit the total number of trains that can access the terminal.