04-06-2012, 05:21 PM
Our s-1 ALCO manual said normal operating temprature was 180 degrees. In 14 years I never saw it over 160, even working hard. The GP7 would reach temprature for the shutters to open but we only waited until we had air pumped before we went to work which was only about 4 minutes with either locomotive. They are much like your automobile, they will warm up while working, and with todays fuel cost we never let them run more than needed.
Charlie
Charlie