While I was tramming at Redburn in the winter of 71/72 we were late coming out on 17fm level on a Friday nightshift so we parked up in the charging bay leaving the wagons full to be emptied first thing on the following Monday morning.
On a bitterly cold morning that was an experience with us being the trammers on the dayshift.
Although not looking so glamorous as in Paul's image it was clear that the temperature was well below freezing underground with stalactites/curtains/drips of ice extending from roof to floor. The loco was coupled up to the rake of wagons to move them to the station however the loco slid on the rails without any wagon movement as the wagons were frozen to the track. An oxy-acetylene blow torch was used to unfreeze the wheels then the same procedure was used to defrost the ore/water that was frozen within the butts. Care had to be taken in the gantry while tipping the wagons, I recall the first one went straight into the bin. It took till lunchtime to empty the set of wagons.
Learned from it though, always empty the wagons as soon as you bring them back in winter!!!