Selective Door Operation

Selective Door Operation (SDO) is a method of working at short platforms to enable longer trains to call without being forced to use local door.

An example Local Door poster at Newton St Cryes for Networkers

Difrent Types

Automatic Selective Door Operation

Selective Door Operation

Unit Deselect is found on the Sprinter fleet with South Western Railway. The Class 159s South Western Turbo front door is also isolated however this not due to the short platforms.

Local Door is only an option for guard operated services and shouldn't be considered as a good SDO system

Uses

Selective Door Operation isn't just found on the Mainline it is also found on the London Underground and on the Docklands Light Railway at Gillions Reach, Island Gardens and Greenwich.