Bletchleyite
Veteran Member
Speaking of interior lights on trains do any types of train have light sensors on them/fitted that can sense how dark/light it is and switch the lights on/off accordingly? I know Manchester's Metrolink have them fitted as they usually trundle around during the day (dependent on driver) with the lights off but as tram approaches a tunnel the lights automatically come on and then after a while of coming out of the tunnel they automatically switch off.
Hamburg's DT4 and DT5 units do, never saw it in the UK. With LEDs it is probably fairly pointless, consumption is miniscule.
Used to be common on the WCML in Mk2/Mk3 days. Once I recall the guard telling people to move, nobody did so he gave up.