Is the Alpha Cement Plant still operating in Martins Creek, PA? When I was there in the late 1990s it was in operation and there spurs were jammed with freight cars. In fact, the facade of this plant was the cover of the 1988 LNE book. Nothing had changed. Now on google maps it looks as though the place is derelict. Nothing spotted on the sidings and the building looks as if it's ready to implode on it's own.
carajul,
It was always my understanding that after the cement business closed the silos were converted for use as grain / flour storage by Con Agra which has their main facility further to the south on the former L&NE.
Also note when looking at any of the mapping programs with aerial photos, most times the photos are taken in the early spring, which may not be a time that grain deliveries would be high. Those same photos could be up to 5 years old or more.