Substation 42
Why it's listed
Substation 42 is a brick-and-concrete electrical station at 154 East 57th Street in Midtown Manhattan, built in 1917 under IRT Contract 3. It converted high-voltage alternating current into the low-voltage direct current that ran through the subway's third rails. The single-story, double-height building has a striated brown brick facade on a pink granite plinth, a stone-coped parapet with Art Deco-style geometric panels, a large window bank, and two portals. Inside, exposed steel trusses carry a concrete ceiling, and an overhead bridge crane spans the main room. It is simpler than the earlier, highly stylized substations, but it is among the best surviving examples of a Dual Contracts substation. It was the last substation in the system to run original manual rotary converters, which operated until 1995. It supplied power to the Lexington Avenue IRT line and a BMT line, and now sits among modern office towers and retail space. Its listing recognizes its role in transportation, engineering and the city's expansion.
Significance in brief: It is significant for transportation and community planning and development because it powered an IRT subway extension during the Dual Contracts period. It also meets the criterion for engineering and architectural design as one of the best remaining examples of a typical Dual Contracts substation. It was the last fully operational substation in the subway system using original manual rotary converters, which ran until 1995.
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 06000024, listed February 9, 2006. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence high).
Key facts
| Address | 154 E. 57th St., New York |
|---|---|
| County | Manhattan |
| Listed | February 9, 2006 |
| Reference number | 06000024 |
| Resource type | Structure |
| Period of significance | 1917 |
| Architectural style | Late 19th and Early 20th Century American Movements |
| Criteria |
|
| Areas of significance | Transportation, Architecture, Engineering, Community Planning and Development |
| Level of significance | Local |
| Status (as stated in the nomination) | The building is in good condition and substantially intact, though the equipment has been removed and modern electrical equipment has replaced the rotary converters. |
| Acreage | 0.9 |
| Coordinates | 40.76042, -73.96864 (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 06000024.
- Nomination form (PDF, National Archives) — catalog entry
- Wikidata Q6134975
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.