as for 76 i had just got my train driving job at coulsdon north depot because they reduced the driver age from 23 to 21 and i was 22 and part off the process you have to learn the routes as in signals stations speeds all up to " in the dark " standard as trains didnt have head lights so "route learned " for over a year un restricted because the railway tried a flanker training us under the old system off 6 weeks not including rules and regs rather than the 21 age 26 weeks full training off rules and regs so needed union to agree before being passed fit for full driving duties so enjoyed the full summer and most off the next year without being on the active roster