	The locomotive that became 2124 was originally built as Reading Company class I-10sa 2-8-0 number 2044 in 1924. Starting in 1945, Reading began building a new class of 4-8-4 Northern-type locomotives using the boilers and fireboxes from the I-10sas, designating these new locomotive the T-1 class. 2044 underwent this rebuild in late 1946 and emerged in January 1947 as the number 2124.