Abstract :
This paper is intended, not to give a detailed consideration of a subject upon which it is difficult to theorize, but rather to bring to the notice of engineers, who are mostly engaged on high-power plants, the achievements of a little-known department of all railway companies, the object of the department being to protect moving and stationary vehicles. The paper gives a very brief description of the evolution of the lock-and-block system of signalling and the uses of the track circuit as now employed on the Midland section of the London, Midland and Scottish Railway.
