File:Refurbished boiler side - Reading 2100 T-1.jpg

English: Side view of Reading Railroad locomotive 2100 at the former B&O roundhouse in Cleveland, Ohio, in the United States. The Midwest Railway Preservation Society has owned the roundhouse since 1954.

This was originally built in 1923 as an I-10a locomotive by the Baldwin Locomotive Works for the Reading Railroad. It had a 2-8-0 configuration (a truck with two unpowered wheels on one axle, eight powered and coupled driving wheels on four axles, and no trailing wheels); this was known as a "Consolidation" configuration.

Revelle W. Brown, President of the Lehigh Valley Railroad, had been impressed by that railroad's 4-8-4 "Wyoming" locomotives. During World War II, the War Production Board barred railroads from building new locomotives. They could, however, rebuild existing ones. When Brown became president of the Reading in 1945, he decided to have thirty of the I-10a engines rebuilt in a new 4-8-4 configuration (a truck with four unpowered wheels on two axles, eight powered and coupled driving wheels on four axles, and a truck with four unpowered wheels on two axles); this configuration was known as a "Northern". The Reading called thee 4-8-4 rebuilds their T-1 class.

The T-1s were out of service by 1954. The 2100 returned to service in 1959 as an excursion train, but was retired again in 1959. The 2100 was sold for scarp to Streigel Equipment & Supply of Baltimore in September 1967. Train fan Ross Rowland purchased it in 1975, intending to use it for spare parts for his American Bicentennial Freedom Train. Its tender was taken away in 1979.

The 2100 went into storage, and in 1988 when Richard Kughn, owner of Lionel Trains, restored it to operating condition. It was leased to various companies as an excursion train until purchased by Thomas Payne, who converted it to oil. Payne intended to use it as an excursion train, but never did. It was sold again in 2007 to the Golden Pacific Railroad in Tacoma, Washington. It served only a year before going into storage. The American Steam Railroad Preservation Association leased the locomotove in 2011, and it is undergoing restoration by the MRPS in Cleveland.