Just renewed my licence and they have made a change to Class 1; the air brake endorsement (Q) on the physical licence has been reintroduced. I am not sure when this happened, but you'll want to make sure it doesn't get missed when you renew your licence. Maybe it has something to do with the new MELT program, or the fact that it wasn't indicated under endorsements for the driver, but the endorsements list was on the physical licence and it just created too many questions from uninformed LEOs.