Early railways were influenced by the horse-drawn stagecoach era, relying on the engine driver for safe operation and employing railway company policemen to control trains using hand signals, flags, and lamps instead of fixed signals.
The introduction of tall fixed “Semaphore” signals in the 1860s enhanced warning systems for drivers. By the 1860s, the Midland Railway began adopting the electric telegraph for train control, allowing communication between stations and the development of the “Block Telegraph” system. This system, evolving over time, divided the railway line into sections, ensuring safe travel by allowing only one train per section and using bell codes to communicate train movements.
In the 1870s, the introduction of the interlocking lever frame revolutionised railway signalling, consolidating control levers for signals and points in one location, transforming the role of the traditional “Bobby” into a Signalman. The construction of signal boxes was crucial for housing new railway equipment, including the electrical telegraph, with the Midland Railway having 1,925 signal boxes by 1907.
Signalmen on the Midland Railway required literacy, numeracy, and self-discipline, using tools like the “Train Register Book” to prevent errors and ensure safe operations.
Single lines in Midland Railway signalling posed risks, even with the introduction of the electric telegraph. Procedures were developed for trains to carry a “Token” authorising single-line occupancy, preventing collisions. The use of electricity in railway signalling brought significant improvements in safety and efficiency, with Track Circuits introduced for better control.
Post-World War I, the London Midland and Scottish Railway advanced technology, leading to the modernisation of signal boxes and the transition from manual to power signalling systems. Today, some historical signal boxes remain operational, preserving the Midland Railway’s signalling legacy and innovations.
A wealth of information is available on signalling in AN INTRODUCTION TO MIDLAND RAILWAY SIGNALLING By Dave Harris, which can be viewed and downloaded below.
If you’ve enjoyed your visit, why not consider becoming a member? Great benefits including high quality journals and more.
