Thousands of commuters across London use the Underground every day as part of their commute to work, to visit friends and family or to simply get from location A to location B. Although many of us take the Tube for granted and might find ourselves staring aimlessly while on board wishing we could be anywhere else, there are lots of interesting facts about Underground to be discovered.
One of the Tube’s greatest mysteries, for example, can be found found throughout the London Underground train carriages. You likely come across one every time you’re on the Tube but probably haven’t stopped to wonder what they actually do.
It is, of course, the gauges that can be found throughout the London Underground train carriages. Not seen them? Well, you haven’t been looking hard enough. On different Tube lines they are positioned in different places, sometimes they are below seats, sometimes by the single door entrances and on others between the carriages.
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So what are the gauges for?
When you study them closely they have a dial from zero to seven and the word ‘Bar’ and London Underground Limited.
‘Bar’ is the unit of measure for pressure so it is safe to presume that the dials are there to keep an eye on the brakes.
The best thing though of course is that they actually move, which can make a boring journey slightly more entertaining.
What do Transport for London (TfL) say?
In a recent Freedom of Information request from a member of the public and then published online TfL said: “The gauges that the requester is describing are the brake cylinder pressure gauges that we have on every car.
“These indicate the air pressure in the brake cylinders in real-time and are used by operational and maintenance staff for monitoring status and fault-finding.”
Why are gauges inside?
The gauges are presumed to be inside as it is safer and easier for maintenance staff to check them then when on the outside.
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