How about:
"8 January 1982 was a dramatic day on the Cambrian Coast line, when two trains became trapped in the snow. One coach of an empty DMU became derailed near Tal-y-Bont; the crew managed to uncouple the derailed driving trailer vehicle and escape to Porthmadog in the remaining power car. The 12:10 Pwllheli - Dovey Junction service train, again a DMU, became trapped in a snowdrift near Tonfanau, with the driver, guard, four passengers and a railway maintenance worker aboard. Luckily, the train heaters were working. According to a Railway Magazine report:
The driver and guard struggled through 90 mph gusts of wind and falling snow to a lineside telephone four times between 14:30 and 21:00 to try and find out what was happening. 25 201 was sent from Machynlleth to assist, but this could not get through snowdrifts near Tywyn. Another Class 25, fitted with miniature snowploughs, was sent from Shrewsbury, but was delayed by snowdrifts and frozen points. A helicopter from RAF Valley tried to reach the train, but was unable to do so, and eventually, after spending the night in the train, the passengers and railwaymen were taken off by the helicopter which managed to land nearby at about 10:30 next morning and given breakfast at a local guest house.
25 201 managed to collect its stranded sister loco and the DMU at Tonfanau on 10 January, but became derailed itself while trying to reach Tal-y-Bont, and yet another loco was sent, only to become stuck itself. The line did not reopen to traffic until 18 January."