Back in the 80s in Co Limerick in Ireland there used to be a Silvermines to Foynes harbour stone train.
The job was book on and work the previous day's empties to Silvermines, load and work back and get relief by the afternoon men.
The afternoon men would then work the train to Foynes harbour and whilst it was unloaded, take a pnb, then back to Limerick, stable the empties, loco to depot and book off. A very nice job which meant an early finish most days.
I went down the Foynes branch from Limerick on a stone train this one day. Having run round and whilst waiting for the empties, the Driver said, "...now lad its time for a little refreshment.." so together with the Guard we headed off along the sidings to a little break in the fence, which lo and behold led to a small little pub.
"Afternoon, lads" said the publican "Three pints of the usual Dermot ? (the Driver).
"That will do nicely" said the Driver.
Of course each was required by tradition to buy a round, and after a good hour we all walked back slightly happier to the train, which by now was ready.
Off we went, back along the freight only line to Limerick, into the sidings, released the loco onto the depot and away home for tea !
Such "little things" went off on the small branch lines, but in fairness the same men on the mainline and on Passenger work would never touch a drop until they had arrived back and booked off, and I can give testament to having been to some serious sessions after working jobs back out from Dublin !
Experience over the years reveals that these little goings on were known about but tolerated because no one was ever unfit through drink, and never imbibed whilst on the mainline.
Another example of the Traction Inspector and Train Crew manager knowing "their men" and knowing when and where to turn a weather Nelson !
Of course all this has changed these days and with the inception of computerisation, the locomotive "knows" how a particular Driver drives by medium of being in permanent contact with the central database and should a Driver start to drive "outside" his profile, a message is printed in Control and to the Inspector.
Gone now are the days when you could sit in the seat and do some "real" driving, because any slight infraction will be reported by the on-board computer, and one can expect to meet a very nice Inspector at destination for tea and biscuits and a "little chat" !