According to the master drawing lists for the T1, there are 1,530 PRR part numbers associated with the T1 and Tender. Of these, 350 of the original large format drawings are known to exist in the PRR collection at the State Archives in Harrisburg. We do not yet know how many of the original small format drawings still exist, but most of the PRR engineering drawings were microfilmed in 1954. These films are available in both the State Archive in Harrisburg, and the PRRT&HS archives in Lewistown. If a component can’t be found in either of the PRR sources, the BLW archives are also available at Harrisburg, although they have not been fully catalogued, and we don’t know how complete the Baldwin T1 drawing set is. Most of the major structural components are identified as either Nickel Steel, or Timken High Dynamic steel, both of which we have identified the mechanical and chemical properties for. We feel that presently, we will be able to access better than 90% of the original design information. We may have more difficulty in documenting the Timken bearings, Franklin Railway Supply components, or other catalogue items purchased from outside suppliers.