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What is the point of this light bulb ?
Neil - get a life! 
Quote from: neilep on 10/01/2009 12:05:18What is the point of this light bulb ?To distract people's attention off the map, which is incorrect... 
You were probably in one of the power cars and this light may be there to show maintenance people working on the car back at the depot that there is still power to the car from the track when the doors are open i.e. leave with caution (they won't be walking on to a platform but more likely down to rail level). If so, it's functioning both as a safety and diagnosis indicator while people are maintaining it.