Railway block code
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The railway block code is a system of bells used to send simple messages about train operations from one signalbox to another. Although codes varied from region to region the following shows a few selected UK Western region bell codes:
- 1 bell - call attention
- 2 bells - train entering section
- 2 - 3 bells - is line clear for light engine
- 3 - 1 bells - is line clear for stopping passenger train
- 4 bells - is line clear for express passenger train
- 2 - 1 bells - train arrived
- 3 - 3 bells - blocking back
- 5 - 2 bells - release token
- 2 - 5 bells - token replaced
- 6 bells - obstruction danger
- 16 bells - testing bells and instruments