This book, "Modern locomotive engineering, with questions and answers The air brake, including both the Westinghouse and New York systems 2, nos. 1-6", by Calvin F. Swingle, is a replication of a book originally published before 1908. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible. This book was created using print-on-demand technology. Thank you for supporting classic literature.