Locomotive No. 6755
Also known as: Class M1b, Mountain Type
Why it's listed
Built in 1930 as a 4-8-2 Mountain-type steam locomotive, No. 6755 belonged to the Pennsylvania Railroad's Class M1 family, which was designed to haul both freight and passenger trains. The first M1 engines appeared in 1923, and the class run ended with 100 locomotives, the last of them from 1930. Its drivers measure 72 inches in diameter, and its boiler operated at 250 pounds of steam pressure. In 1946 a number of Class M1a locomotives, including this type, were upgraded and reclassified as M1b, adding a twenty-pound increase in steam pressure. The class proved most valuable on freight, and in its final years these engines were assigned increasingly heavy tonnage while diesels took the faster runs. No. 6755 is the only surviving example of its class, and it is listed as part of a group of rolling stock that documents Pennsylvania Railroad equipment.
Significance in brief: The nomination argues the locomotive is the only surviving example of its class. The Mountain type was a dual-service engine, and the class was used heavily on freight work in its later years. The listing is part of a group of rolling stock that together represents historically significant railroad equipment.
Machine-generated summary. This summary was generated by a language model from the official nomination document and has not been reviewed line by line by an editor. It may contain errors. Check the source document before relying on any detail. Source: nomination document (PDF) · National Archives catalog entry. NRHP reference 01000519, listed December 17, 1979. Summary generated October 2026 (model claude-haiku-5-5, prompt v1.1-2026-10-29, confidence medium).
Key facts
| Address | E. of Stasburg, Strasburg |
|---|---|
| County | Lancaster County |
| Listed | December 17, 1979 |
| Reference number | 01000519 |
| Resource type | Structure |
| Period of significance | 1930 |
| Criteria |
|
| Areas of significance | Commerce, Transportation |
| Level of significance | National |
| Acreage | 0.9 |
| Coordinates | 39.98242, -76.16077 (NPS GIS) |
What listing means for this property
National Register listing is honorary: it recognises significance and does not restrict what a private owner may do without federal money or permits. It unlocks the 20% federal rehabilitation tax credit for income-producing buildings, state credits in many states, and Section 106 review when federal agencies are involved. See what listing means in practice.
General information, not legal or tax advice. Rules change; confirm with your State Historic Preservation Office or a qualified adviser.
Sources and further reading
- National Park Service, National Register of Historic Places database (snapshot May 2026), reference 01000519.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q16898805
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.