My father was in charge of the PRR's Mt. Union creosote plant from about 1950 until it was closed about 1960. There is an article about the plant in the August 1953 issue of the Pennsy, the magazine for Pennsy employees. Unfortunately, the only photos I have of the place are those in the article.
One very intriguing feature of the Mt. Union plant was that it was largely a dual guage facility. Standard railroad tank cars brought the creosote to the plant. Coal for the boiler came in standard Pennsy hoppers. Ties came in for treatment by either truck or standard railroad gondolas. Treated ties were shipped out in gondolas. However, in the plant, ties were moved from the green tie stacks to the plant and out to the black tie stacks on narrow gauge equipment. As reflected in one of Stauffer's Pennsy Power books, the plant had a narrow gauge steam engine to move the ties around in the plant. Stauffer does not mention the narrow gauge diesel was in the plant toward the end. I understood that it came from the Navy.
As I recall, there were only two major buildings in the plant. (There were perhaps, a few sheds on the property.) One was the office, a two story building resembling a switch tower with the second floor windows looking out on the plant. The other building was the creosote plant. It was a fairly large corrugated metal (as I recall now) that housed the coal-fired boiler and the pumps and piping for heating and handling the creosote. Another part of that plant was a large horizontal cylinder. One end was a hinged end of cylinder with a bolt arrangement around the circumfirence to seal the end. Green ties loaded onto cars looking somewhat like skeleton log cars were pushed into the cylinder. A connecting piece of track was removed and the end closed and sealed. Heated creosote was then injected into the cylinder to treat the ties. After the treatment, the cars were pulled out of the cylinder.
A large self-propelled yellow railroad crane would then stack the treated ties in large stacks. The MTH American crane is a fair resemblance of the crane, but I do not believe that model is powered. The crane would unload gondolas and trucks that brought the green, untreated ties to the plant and stack the green ties to age before treatment. The crane would also take the green ties from the stacks and put them in the cars for treatment. After treated ties cured a bit, the crane was used to laod them into gondolas. The crane was also used to move standard railroad gauge cars around.
There was a small pond behind the plant that had narrow gauge track leading to it. From the color of the water, I would guess it had waste creosote in it. Perhaps some cleaning of the tie cars took place there since the were in the cylinder with the creosote.
I regret that I do not have any pictures of the place or a track plan. But it essentially consisted of stacks of green (untreated) ties; stacks of black (treated ties), the plant, the office and associated trackage. One standard railroad siding ran alongside the plant for the delivery of coal and creosote. As I reccall, the firebox for the boiler was below ground level so coal dropped by gravity into the bin for the boiler.
Unfortunately, my father passed away some years ago, so I cannot ask him anything about the plant.
Andy