Abbreviated term for Train Operated Warning SystemA system that gives trackside staff audible warning of the approach of trains by means of ‘safe’ and ‘warning’ tones, activated by the Signalling System... More.
The site for Miniature and model signalling!
Abbreviated term for Train Operated Warning SystemA system that gives trackside staff audible warning of the approach of trains by means of ‘safe’ and ‘warning’ tones, activated by the Signalling System... More.