I've added two illustrations of controller panel made by NMA of Netherlands for Indonesian Railways' grade crossing. There are two versions: 2 boom gate and 4 boom gate, controlled by a single switch and a red "Stop" button for temporarily stopping the boom gates (in case if a road vehicle is trapped inside the crossing.
A. 2-boom gate

Basically it has 4 notches, listed in clockwise direction:
- "Normal" - the crossing gate is off
- "Lampu dan Sumer" - activates warning lights and sirens
- "Tutup Pintu 1 + 2" - lowers boom gates #1 and #2
- "Buka Pintu 1 + 2" - raises boom gates #1 and #2
To turn off the warning lights and sirens, crossing operator only had to turn the switch back into "Normal" position.Since the controller switch was designed to be "rotating in 360 degrees manner", crossing operators doesn't need to worry about the direction of switch itself, as long as they conducts safe operations when operating the crossing. The condition of warning lights are displayed by two orange lights located above the "Stop" button.
B. 4-boom gate

While it has same functions with the 2 boom gate ones (even the basic layout is same), there are 6 notches for the controller switch:
- "Normal" - the crossing gate is off
- "Lampu dan Sumer" - activates warning lights and sirens
- "Tutup Pintu 1 + 2" - lowers boom gates #1 and #2
- "Tutup Pintu 3 + 4" - lowers boom gates #3 and #4
- "Buka Pintu 3 + 4" - raises boom gates #3 and #4
- "Buka Pintu 1 + 2" - raises boom gates #1 and #2
For those who are interested to how Indonesian Railways' crossing operators are operating the grade crossings with the controller panel as shown above, there is a video that showcases the operation of grade crossing in Indonesia (the scene for operating the crossing starts from 12:29, complete with the radio communication done by the operator for confirming the presence of a train that is about to pass the grade crossing):
Cheers,
Arya.
"Prepare for the worst, even if the result is actually better than the expected"