Olwein Iowa CGW Railroad Round House Locomotive 604 Real Photo Postcard

Mallet locomotives, such as Chicago Great Western Engine No. 604, represented a significant advancement in steam power during the early 20th century. Developed by Anatole Mallet, these articulated engines were designed for exceptionally high tractive effort, enabling them to haul extremely heavy freight trains over steep grades and tight curves. With a listed weight of 252 tons, a length of 82 feet, and 84 tons of tractive power, this specific locomotive was among the powerful machines utilized by American railroads for demanding tasks.