Matthias N. Forney was an American engineer and author, best known for his influential work in the field of locomotive engineering. His most notable publication, "Catechism of the Locomotive," served as an essential guide for understanding the mechanics and operations of steam locomotives during the late 19th century. This work not only provided technical insights but also aimed to educate a broader audience about the significance of rail transport in the industrial age. Forney's contributions extended beyond his writings; he played a pivotal role in advancing locomotive technology and safety standards. His expertise and advocacy for improved engineering practices helped shape the future of rail transportation in the United States. Through his writings and professional endeavors, Forney left a lasting impact on the engineering community and the burgeoning railway industry, making him a notable figure in the history of American transportation.