KRM-SHAY-HO-S-A7 The Shay, Arcata #7 50 Ton 2-Truck Shay Locomotive (DCC Sound)The Shay locomotive was the most widely used geared steam locomotive. The locomotives were built to the patents of Ephraim Shay, who has been credited with the popularization of the concept of a geared steam locomotive. KR Models representation of the Shay is a generic 50 ton 2 truck Shay. Although the design of Ephraim Shays early locomotives differed from later ones, there is a clear line of development that joins all Shays. In 1884, they delivered