Freight drivers travelling pass will be asked for assistance by passengers fairly often. I always tried my best to help but frequently I would be in a location where I knew as much (or as little) as the passenger asking the question.
With regard to taking breaks (PNB's) on a train. Freight drivers are often booked to take a break on passenger services, and yes, on occasion they may fall asleep, especially if they've been up all night driving.
...an often heard quote from past times - " This would be a lovely job if it wasn't for the passnegers". Are freight drivers happier folk than their passenger counterparts ?
Nothing can beat the feeling of being on the footplate of a loco, looking out of the window at 400 yards (and more) of wagons whilst belting along at 60mph.
Its not quite the same driving a 4 car DMU in my opinion. Hours are better on passenger work though.