Notable and Preserved Equipment
The Northern Pacific was known for many firsts in locomotive history and was a leader in the development of modern steam locomotives. The NP was one of the first railroads to use Mikado 2-8-2 locomotives in the United States.
The NP's desire to burn low grade semi-bituminous coal from company-owned mines at Rosebud, Montana, played a part in the development of the 4-8-4 wheel arrangement for steam locomotives. With a BTU fifty percent lower than anthracite coal, the NP's locomotive design called for a much larger firebox, and thus an additional axle on the trailing truck. This led locomotive designers from the 4-8-2 Mountain to the 4-8-4 Northern, first produced by Alco for the NP in 1926 and designated the Class A by the railway.
The 2-8-8-4, called the Yellowstone, was first built for the NP by Alco in 1928 and numbered 5000, Class Z-5, with more built by Baldwin Locomotive Works in 1930. The large locomotives were designed to handle higher tonnage on freight trains while simultaneously eliminating the need to use more 2-8-2 Mikados and crews. They originally served in the western North Dakota/eastern Montana territory.
The Northern Pacific purchased Timken 1111 called the Four Aces, the first locomotive built with roller bearings, in 1933. The Northern Pacific renumbered it 2626 and classified it as the sole member of locomotive Class A-1. It was used in passenger service in Washington, Oregon, Idaho and Montana until 1957 when it was retired from active service and scrapped at South Tacoma, despite attempts to preserve the locomotive. After Timken 1111, the NP bought only roller bearing equipped steam locomotives, with the exception of four 4-6-6-4 Class Z-6 locomotives that were later changed to roller bearings.
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