I my memory is correct, after that 78 trip, there was nothing during the winter until 1983 when OY was used 2 times. Once to clear the line for a commercial, or movie shoot, and a second time to open the railroad. Next run was when I saw it in 1991.
Again from memory
1991 Plow ran with 487 and 488
1992 No plow run
1993 Plow ran with 487,488, and 497
1994 I think this was a one day plow run, light snow
1995 Big Snow like 1993, three engines used, rotary broke beyond Los Pinos as it headed for Osier
1996 Snow bucking train without Rotary I beleive
1997 Big Rotary run, 487,488,484 operated and this was the first year it was painted Gray again, and first trains for George Bartholomew. Rotary ended with a huge boulder laying across the tracks around Long Run(east of Los Pinos Phone Booth)...Quite impressive to see.
1998... probably snow bucking train with pilot plow engines
1999, year the flanger train derailed at Los Pinos
with damage to 484.
Greg