SNCF - 14/11/1999 at Laroche-Migennes workshop, during an exposition.
<br>
BB 22387 <br>
This is a view of the command used to lift the 1500 Volt DC pantograph(s).
To lift them, the driver puts a special key in the hole and selects the 
desired position. 
<br>
There are 4 positions (from right to left):
<ul>
<li> 0 : The neutral position, the 2 pantos of the locomotive are down.
<li> N : This lifts and keeps in that position the special DC-pantograph.
<li> NS : Like the "N" position, but it lifts also the AC panto. Under DC current
the driver must absolutely lift 2 pantographs during starting up, because the
current intensity reaches big values (Ohm's law) and there is a risk of burning 
the catenary. When the train runs about 10km/h, the driver can go back to
the "N" position. This will put the second pantograph down. 
<li> S : This position isn't frequently used. It allows to use the AC pantograph
with a DC catenary in case the normal DC pantograph isn't working properly.
</ul>
<br>
Please note that the command key can be taken off from the hole only in the 
"0" position.
<br>
Photo taken from a video film of mine, that's why the quality is poorest than
with a "normal" photo.
<p>
Adam Galkowski - bb17000@caramail.com