Operation
The line into London Bridge became increasingly congested so at Corbetts Lane a white disc was installed, to be operated by the pointsman. It, or at night a red light, showed that the route was set for Croydon. If the disc was edge on, or a white light showed, the junction was set for Greenwich. It is believed that this was first fixed signal used to control a junction. Greenwich trains ran every 15 minutes, Croydon trains were hourly. The first railway semaphore signal was erected by Charles Hutton Gregory on the railway at New Cross, about 1842.
Read more about this topic: London And Croydon Railway
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“You may read any quantity of books, and you may almost as ignorant as you were at starting, if you don’t have, at the back of your minds, the change for words in definite images which can only be acquired through the operation of your observing faculties on the phenomena of nature.”
—Thomas Henry Huxley (1825–95)