"Suburban" Class 455 unit on the Waterloo-Waterloo via Hounslow "loop" service. Most services on weekdays use a Class 450 Desiro but weekends sees these used as much as possible, especially as all services are usually 4 car all day. As platforms at Virginia Water and Chertsey are too short, 8 car 455s are not permitted to open doors there as there is no Selective Door Opening system fitted. The Class 450s have also required a derogation from the Rail Safety & Standards Board as SDO systems that are manually set are usually not permitted, and an auto system using track-side sensors (called a balise) provides the train with information on how many doors to open.
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