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Headlights for electrostars. - TSW

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SamuelUK

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I noticed that the class 377 and 387s in London Victoria to Brighton have a day running and night running headlight options. How is it decided what setting is used? Is it more like car headlights with visibility?
 
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westcoaster

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Just as it says, day during day light and night when it's dark.
No difference really between the two.
 

SamuelUK

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Day running puts the offside headlight on, whereas night running puts the driver's side headlight on. Both settings also have both markers on.
I got that, I was trying to say how do they determine which one to use. Do they run off a time? Is it down to drivers personal judgement?
 
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