An immediate problem would be the fact wagons were not dual braked. Wagons could be blow-throughs where a pipe would be fitted to allow for brake continuity but this would not allow the wagon brakes to be operated on the vehicle concerned. Leaving a Loco in the vacuum position would effect brake timings; Quicker Timings for Passenger and Extended timing for Goods. Air brakes work well, Vacuum works well. In very local instances a strange practice may have existed. But my question would be why would you want to play about with brakes. As a Driver I would dig my heels in before doing anything not allowed. After all the very first rule is 'Safety is my first consideration'. Taking chances! Why would you want to!!
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