(14 Aug 2016, 8:40 am)Jamie M wrote Timings probably have something to do with this. Calling control and depots to work out what to accept and not accept is a time consuming process - maybe providing drivers with a flyer of what to accept and not to accept depending on the route would be helpful.
Through the radio, where you can get a response in seconds?
I boarded a GNE vehicle last year at Regent Centre with a scratchcard where I had won free travel, and the driver radioed Control asking if they're valid and what ticket he should issue, within a minute, and he issued a ticket when stationary after he had got a reply.