There is an interesting pic of a Pindi Murree bus on one of your links. It also has Shooting Mail written on it. There were two bus services between Rawalpind (Pindi) and Murree, a distance of 39 miles. One was Pindi Murree Transport, the other Murree Hills Transport. Pindi Murree buses were red in colour while Murree Hills were green. Although it says government transport on the bus, I remember them to be private services. Rode on them several times. The route started at 1000 feet altitude and ended at 6000-7000. Murree was the hill station of Pindi.