Central Line 1992 stock light clusters

[Flying Scott]

The last time I was in London and travelled on the Underground, I noticed on the Central Line 1992 stock that they have slightly different headlight clusters compared to other stock. Looking at the cab from the front, the left cluster has (Red - White - Amber) and the right cluster has (Red - White - Red). The white lamps are the headlights and the outer most red lamps are the tail lights. I assume the innermost red on the right cluster is the stabling light, but I haven't been able to determine what the amber light is on the left cluster. I haven't seen it on any other train so was wondering if someone could advise me, please?

 

[Lewlew]

RM (Restricted Manual) light, flashes yellow when the train is being driven in RM (not communicating with the signalling system, or in the depot). All ATO line trains have it.

You also have a calling on light there somewhere which all trains have, used for incapacitated driver, push outs etc

 

[Daniel]

Yeah I was wondering if you were referring to the calling-on light.

https://www.squarewheels.org.uk/rly/stock/1996tubeStock/

See approx halfway down for a picture of a 96TS with the calling on light switched on, under the Stratford Market Depot entry.

 

[Flying Scott]

Thank you @Lewlew and @Daniel, you have been most helpful.