Starting at around 1 minute there's some real "coal rolling" going on. Put those silly diesel truck guys to shame that like to do that on the road......
LOL! That "coal rolling" was necessary to make the grade.
The tall, white plume of steam is the pop valve. The engine is purposely being fired "against the pops" in order to make the grade. You have to roll a lot of coal to do that.
As the 765 leaned into the grade, Gary Bensman, the engineer running the 765 on this day, realized that it was going to be a very tough climb up this four-mile hill. He had the whole passenger train, plus four gons of coal, and an idling diesel on the rear of the train for an upcoming reverse move. He told the fireman, Jason Sobcynski (I hope I spelled that right) who is also very experienced, to fire against the pop and get the pressure up to 260 psi. The normal max operating pressure is 245. The maximum operating boiler pressure for a steam locomotive is determined by the loads imparted to the running gear at full throttle, not the ability of the boiler to handle a higher pressure. For the short time the additional pressure was needed, there was no danger of doing any damage to the running gear. Jason had just begun the process of raising the pressure when the 765 reached her slowest point on the grade at .68 mph. As the pressure climbed above 255, the speed picked up slightly to about 1.5 mph until they crested the hill at MP4. If the pressure had remained at 245, they would have stalled.
The rail conditions on this day were perfect. It was a warm, sunny day. This line is well-used, so the rail was shiny and clean. There was no danger of the drivers slipping. In fact, as I pan the cab when the 765 goes by my camera and Gary gives me the thumbs up, note that he does not have his hand on the throttle. No need to on a day like this.
I guess you could say we ran the 765 at 106% power for a couple of miles on this climb.