| Event type: | Talk |
| Date: | 11 November 2025 |
| Time: | 2:30 PM |
| Group: | Science and Engineering |
| Venue: | Progressive Hall |
| Organiser: |
Brian Mitchell will talk about London Underground’s Telephone System.
Also known as Emergency Traction Current Discharge System (ETCDS). This system allowed train operators to talk to signalmen and isolate parts of the line in case of emergencies.
The system was introduced in 1901 and was eventually replaced in 2006. A system that worked effectively for nearly 120 years!