A Locked Elevator cannot be operated until it is unlocked with a switch or access card.
Create an elevator. Place an
L[0,Channel] in the elevator sector. Then place a Switch, or Access Switch (#130 or #170) tagged
[ActivationSound,Channel] somewhere in the map. It will be used to unlock the elevator (the elevator can be toggled between locked/unlocked with a regular Switch). If you use an Access Switch, place an Access Card (#60) somewhere. A value of 212 is the standard choice for an Access Switch's
ActivationSound. To change the colours of the Access Switch and Card, adjust their palettes:  = blue,  = red, or  = yellow.