enlarged layout also accommodating the South Eastern Railway. John Urpeth Rastrick claimed to have suggested the idea to Hutton Gregory.

The semaphore was swiftly embraced across Britain and North America as a fixed manual signalling system, surpassing all other types in most applications by 1870. Becoming electrically operated and automatic, accompanied by interlocking, they were widely adopted in the U.S. After 1908, with the advent of the Union Switch & Signal