An Introduction to Large-Lap Valves & Their Use on the LMS

In the complex field of valves and valve gears, one of the less discussed areas is that of short or long-lap valves. In Britain, the Midland Railway’s engineers had used short-lap valves, and were regarded as incompetent by no less an authority than the late E.S. Cox for adhering to them. But Cox and others within the LMS/Crewe establishment were long-lap valve men and used them. In this interesting and technical review of LMS practice,  Adrian Tester comes to some interesting conclusions on the subject (and which I will not reveal here). 102 spiral bound pages. Numerous diagrams and tables, including one separate fold-out diagram. Paper covers.