J Wrote:
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> Curry is located in a portion of the former PRR car shops at Hollidaysburg, PA near Altoona. Many locomotives were scrapped here over the years and undoubtedly this locomotive’s truck came from an NS unit (they’re now scrapped in Cresson.) Curry fabricates cabs for NS and has branched out to building these units.

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Curry apparently builds these for Tractive Power Corporation (thus the "TP" in the model #), located in British Columbia.

"As Class 1 railroads continue to shed as many switching operations as possible, numerous industries have begun to perform their own switching or contract it to private operators. This, along with more stringent emission regulations, has opened a new market for small motive power. British Columbia- based Tractive Power has a unique solution: a compact ( 27 – foot , 10-inch), robust, three-axle, diesel-electric switcher constructed using a single EMO HT- C truck, three D77 traction motors, and half the frame of an EMO 50 40-2. The TP56 (56,000 pounds tractive effort) and TP70 (70,000 pounds tractive effort) models are customizable and available with U.S. Environmental Protection Agency Tier 3 ~ or Tier 4-compliant diesel engines.

The prototype proved successful and went to work at Parrish & Heimbecker grain facility in Cloverdale, B.C. The second locomotive, a TP70, was delivered to a customer in Vancouver. Tractive Power, meanwhile, struck a manufacturing agreement with Curry Rail Services to produce TP switchers at its shop in Hollidaysburg, PA."
[www.tractivepowercorp.com]

Find more via
* [tp56 locomotive annual] [www.google.com]
* [trn.trains.com]