Simplified curve and switch work: a collection of valuable points for the supervisor and foreman and for college instruction This book, "Simplified curve and switch work: a collection of valuable points for the supervisor and foreman and for college instruction", by Walter F. b. 1868 Rench, is a replication. 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.