This delightful little book, written under the pen name of "Semmer Fore", describes the day to day activities and habits of a typical S&T lineman and how he (it was always he when the story was written) interacts with the signalman. Although set in the 1930s it could be equally true of any period from the 1890s to the 1970s and possibly today where mechanical signalling rules the day.
There is a description of locking and other equipment in use at a mechanical signal box and the (mis)use of locking rooms below the operating floor for purposes not intended by the Engineer.
Written in a light-hearted manner the author was, nevertheless, well qualified and experienced to know the subject. His identity is revealed at the end of the book.