![Token system at the signal box at Bridgnorth Railway Station on the Severn Valley Railway Stock Photo - Alamy Token system at the signal box at Bridgnorth Railway Station on the Severn Valley Railway Stock Photo - Alamy](https://c8.alamy.com/comp/AXR9PK/token-system-at-the-signal-box-at-bridgnorth-railway-station-on-the-AXR9PK.jpg)
Token system at the signal box at Bridgnorth Railway Station on the Severn Valley Railway Stock Photo - Alamy
![Tyer's Electric Train Key-Token Instrument; machine for 'talking' between two signal boxes on the singletrack / single track railway line using a system of bell codes. Isle of Wight Steam Railway Museum. Tyer's Electric Train Key-Token Instrument; machine for 'talking' between two signal boxes on the singletrack / single track railway line using a system of bell codes. Isle of Wight Steam Railway Museum.](https://c8.alamy.com/zooms/6/8f7a59c8bcfb4aa9ad196afd61323464/r54xkf.jpg)
Tyer's Electric Train Key-Token Instrument; machine for 'talking' between two signal boxes on the singletrack / single track railway line using a system of bell codes. Isle of Wight Steam Railway Museum.
![Exchanging signal tokens at Arley Station, Severn Valley Railway, near Bridgnorth and Kidderminster, England Stock Photo - Alamy Exchanging signal tokens at Arley Station, Severn Valley Railway, near Bridgnorth and Kidderminster, England Stock Photo - Alamy](https://c8.alamy.com/comp/BEGCTE/exchanging-signal-tokens-at-arley-station-severn-valley-railway-near-BEGCTE.jpg)