Most of Steamtown's collection of steam locomotives, diesel-electric locomotives, passenger cars, freight cars and maintenance-of-way equipment is on display (though it has not all been restored). Here, you may find information about the historic pieces in the Steamtown collection.
The National Park Service also published a Special History Study of the locomotives at Steamtown NHS. The publication, "Steam Over Scranton: The Locomotives of Steamtown," was written by Gordon Chappell and published in 1991. While some of the equipment in that 1991 study is no longer in the Steamtown NHS collection (deaccessioned to other museums), you may find the data related to your research. NOTE: The publication is out-of-print, and hard (print) copies are not available.