Tango 22 is infamous on the railway: it is historically the most SPADed (Signal Passed At Danger) signal in the country. Over 30 minutes, I'll give a crash course in understanding signalling and protection systems, the history and placement of Tango 22, and workshop ideas as to why Tango 22 has the worst record, and how to possibly solve it. I am a railway worker with 10 years experience.