The Development of the Semiautomatic Freight-Car Coupler, 1863-1893

Abstract

Even to the casual observer of railroad freight operations after the Civil War, the handling of freight cars was a most difficult and dangerous process. Some of the problems attending their movement were attributable to a coupling technique which was inefficient and unsafe even in normal circumstances. Most observers readily agreed that an improved coupling apparatus would solve these difficulties; so it was toward this end that inventors and professional railroaders undertook research and development. The difficulty of the task can be illustrated by the length of time it took to produce changes in equipment. The first popular semiautomatic coupler for passenger service was patented in 1863 and adopted for service in 1868. Another model for freight traffic was developed as early as 1880 and was in use by 1884. But it was not until 1900 that almost all passenger and freight rolling stock was equipped with a new, industry-wide, semiautomatic, interchangeable coupler. One of the most vexatious problems caused by poor coupling equipment was the loss of time that occurred whenever trains separated because of coupler failures. Brakemen who sat on top of the cars were ordered to be alert constantly for such an event.1 Most partings were corrected by routine repairs, but time was always wasted, and, on occasion, damage was caused when the separated sections crashed into each other as they were being halted.2 Another source of concern was the loose slack present in the coupling