Within a couple of years of its opening, Brooks was producing as many as seven new locomotives per month, compared to one per month while the facility was controlled by the NY&E. Brooks built locomotives for nearly all of the major railroads of the time, producing 37 new locomotives in its first year and 43 new locomotives in its second year of operations.
After the financial crisis of 1873, orders for new equipment dropped off, but Brooks was able to recover enough business to avoid bankruptcy. Brooks locomotives were displayed a few years later at the National Railway Appliance Exhibition in Chicago, where they were judged the Best in Show.
The 1890s brought another period of depressed sales following another financial crisis. The company produced 226 new locomotives in 1891, but only 90 new locomotives in 1894. Brooks was not able to recover business as easily and the company was merged with several other manufacturers in 1901 to form the American Locomotive Company. ALCO produced locomotives at this facility until 1934 when the shop was renamed ALCO Thermal Products Division. Locomotives produced at the former Brooks plant after ALCO's formation came to be known as ALCO-Brooks locomotives.
Although new locomotives were no longer being produced at the former Brooks shops in Dunkirk, shop forces were kept busy for some time building spare parts for ALCO locomotives. Production had shifted from locomotives to heat exchangers, high-pressure vessels and pipes of all sizes.
After World War II, production at the Dunkirk plant never got back to its prewar levels. ALCO finally closed the facility in 1962.
|Serial number|| Wheel arrangement|
|Build date||Operational owner(s)||Disposition|
|522||2-6-0||April 1881||Klondike Mines Railroad #1||Minto Park, Dawson City, Yukon Territory, Canada|
|(unknown)||2-6-0||1881||White Pass and Yukon Railroad #52||Skagway, Alaska|
|(unknown)||2-6-0||1881||Pacific and Arctic Railway and Navigation Company #51||Whitehorse, Yukon Territory, Canada|
|1535||2-6-0||May 1889||Quincy and Torch Lake Railroad #1 Thomas F. Mason||Quincy Mine, Hancock, Michigan|
|2475||2-6-0||October 1894||Quincy and Torch Lake Railroad #3||Huckleberry Railroad, Flint, Michigan|
|2951||2-8-0||June 1898||Colorado and Southern Railroad #74, Rio Grande Southern Railroad #74||Central Park, Boulder, Colorado|
|3687||4-6-0||November 1900||Wisconsin Central Railway #247, to Soo Line Railroad #2645||North Freedom, Wisconsin|
|3697||2-6-0||December 1900||Illinois Central Railroad #3706||Illinois Railway Museum, Union, Illinois|