in sizes ranging from . There was one single-truck, narrow gauge Heisler built, Lake Shore Stone Products Co. #7 for the Lake Shore Stone Products Co.Lake Shore Stone Co., Milwaukee, Wisconsin? Notable survivors Roughly 625 Heislers were produced, of which some 35 still exist. Approximately eight of these survivors are currently operational. Advantages and disadvantages The Heisler locomotive's gearing was inside the frame and thus protected, unlike that of a Shay locomotive. However, the Heisler's drive shaft, which was located in the center of the frame, limited firebox space. For this reason, when A & G Price built their Heisler, in 1943, they used a Belpaire firebox, to mitigate problems with burning wood and accommodating the drive shaft. References Further reading Anonymous, The Heisler Locomotive, 1891-1941, published by Benjamin F. G. Kline, Jr., 1982. External links Geared Steam Locomotive Works' Heisler pages Locomotives Built by Heisler Locomotive Works Heisler locomotive at Travel Town museum Nelson Riedel's Heisler Locomotive page Geared steam locomotives Articulated locomotives Freight locomotives