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.
Read more about Selective Door Operation: Purpose and Operation of SDO, See Also
Famous quotes containing the words selective, door and/or operation:
“The selective memory isn’t selective enough.”
—Blake Morrison (b. 1950)
“If one does not do evil things in the daytime, one need not fear knocks on the door in the middle of the night.”
—Chinese proverb.
“Human knowledge and human power meet in one; for where the cause is not known the effect cannot be produced. Nature to be commanded must be obeyed; and that which in contemplation is as the cause is in operation as the rule.”
—Francis Bacon (1560–1626)