Here at Southern we get free travel on Southeastern and London Midland. A new thing thats just come in is that non safeguarded staff who retire now get a pass after they go, but thats only a southern thing and may go if we loose the franchise.
As for other rail staff on our services, what is nice to have is that they come up and ask, esp when out of uniform. Was esp miffed to come accross a northern rail pass holder sat down on a busy train. Some staff may have their own unofficial rules on who gets what, but the thing in the back of your mind is one may let you travel with a wink, but all it takes is one on a gate etc and it backfires.
As for the little boxes for safeguarded staff,
I wont say what my pass has got me on other services so not to drop anyone in the deep....but last time I was on northern I did pay, Metro Centre to Newcastle central, SDR 70p. I even gave the conductor some advice on how to stop his advantix jamming, which it had just done :roll: