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Selective door operation
Selective Door Operation, also called Selective Door Opening (or SDO) is a mechanism employed primarily on trains (although buses with multiple doors also generally have this feature) that allows the driver or conductor/guard to open the doors of a train separately.
== Purpose and operation of SDO ==
Selective Door Operation (SDO) is a system used by trains for the safe operation of the passenger doors at short station platforms. The term Selective Door Operation is used mainly in the United Kingdom; some train operating companies used the term ‘Door De-Select’. A version of this is used in other countries and on other rail systems such as the London Underground.
To simplify, some trains that call at certain railway stations are too long for the platform. This caused an operational headache on old stock but was solved by Selective Door Operation. The guard or driver can choose which doors are to be opened so as not to allow passengers to disembark from carriages not standing at the platform.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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