Flashing blue LEDs "below the solebar" on 158s and 166s

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anamyd

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Does anyone know what these are for...? I've now seen them on both Great Western Railway 166s and a Transport for Wales 158, possibly GWR 158s too.
 
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RailUK Forums

LowLevel

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They're status indicator lights for the auxiliary heater. If they're flashing it is indicating an error code.
 

mjmason1996

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I've swear I've seen them on 156's as well, sprinters predate the invention of the blue LED so they must be some sort of retrofit.
 
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