Lesson plan
Railway block code
The railway block signalling bell code is a system of bell sounds used in Great Britain to communicate between manually operated Signal Boxes in implementing the railway block system. (The bell system is not used in modern power signal boxes, other than to any older adjacent signalboxes.) Each such signal box has a bell circuit to the boxes on either side of it along the line. The equipment consists of a plunger or tapper (rather like a Morse key) which when pressed, rings a single-stroke bell in a neighbouring box. That box similarly has a tapper for communicating back, so boxes have keys each of which rings the bell in a neighbouring box. The bells sound different tones, so that the signalman can tell them apart by ear.
Article summary
The railway block signalling bell code is a system of bell sounds used in Great Britain to communicate between manually operated Signal Boxes in implementing the railway block system. (The bell system is not used in modern power signal boxes, other than to any older adjacent signalboxes.) Each such signal box has a bell circuit to the boxes on either side of it along the line. The equipment consists of a plunger or tapper (rather like a Morse key) which when pressed, rings a single-stroke bell in a neighbouring box. That box similarly has a tapper for communicating back, so boxes have keys each of which rings the bell in a neighbouring box. The bells sound different tones, so that the signalman can tell them apart by ear.
Key claims
No claims recorded.
Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
Bibliography
No sources recorded.
Key claims and bibliography are generated from the same tracked claims and sources as the article page.