Blue bodyside indicator light on S-Stock

[rebmcr]

I never realised they were dual-colour, what does that one mean?

I think I heard a lot of fan noise from the driving carriage of that train, is it something to do with de-icing equipment?

 

[Daniel]

Yes it means the train is laying deicing fluid.

 

[Dstock7080]

Outside door indicators on S Stock are three colour:
steady yellow: doors open or unlocked
flashing yellow: sensitive edge activation on car
steady white: RTD Train Ready to Depart indicator (TBTC)
flashing white: PEA activation on car (currently steady white)
steady blue: de-icing fluid dispensing (would be extinguished if other colour required (ie stations)

 

[philthetube]

I never realised they were dual-colour, what does that one mean?

I think I heard a lot of fan noise from the driving carriage of that train, is it something to do with de-icing equipment?

The noise wouldn't have anything to do with de-icing. It could have been the sleet brushes though if the train was moving

 

[rebmcr]

The noise wouldn't have anything to do with de-icing. It could have been the sleet brushes though if the train was moving

Yeah I think that makes sense.

 

[hexagon789]

The noise wouldn't have anything to do with de-icing. It could have been the sleet brushes though if the train was moving

The S-stock has brushes to scrub the rails, how does that work? Are they only applied during de-icing?

 

[Dstock7080]

The S-stock has brushes to scrub the rails, how does that work? Are they only applied during de-icing?

All Underground passenger Stock has sleet brushes mounted on the leading bogie above the positive and negative rails.
They can be lowered at anytime, irrespective of whether the train contains a de-icing car.

 

[hexagon789]

All Underground passenger Stock has sleet brushes mounted on the leading bogie above the positive and negative rails.
They can be lowered at anytime, irrespective of whether the train contains a de-icing car.

Interesting, I never knew that. You learn something new everyday!

 

[philthetube]

They only need to be lowered when there is Sleet/snow on the rails

 

[hexagon789]

They only need to be lowered when there is Sleet/snow on the rails

Is it just London Underground that has these?

 

[spinba11]

I’m sure I’ve seen lights on underneath the carriage as well is that to do with de-icing as well?

 

[Dstock7080]

I’m sure I’ve seen lights on underneath the carriage as well is that to do with de-icing as well?

No, those are the ATMS Automatic Track Monitoring System fitted units 2x S8, 3x S7