Smoke on the tracks shut down a stretch of the Red Line right in the middle of the morning rush. Metro's top leader blames electrical problems he says are decades old.
Don't forget that (depending on the system) the 3rd rail is typically has 600-800 volts going through that rail and most systems never shut down the 3rd rail if the train isn't there so even if the train isn't there the 3rd rail will kill you instantly.
@@lagoontejeraneasea1338 you are misinformed on how electricity works. the 25,750 volt lines you are referring to are overhead lines, away from the ground / pedestrians. electrified third rails must use very high amperage with relatively low voltage, in order to minimize the high potential for electric arcs through the air that low to the ground, which can happen with high voltages. therefore, they often run at 700-800 volts, but upwards of 1,500 amps. this requires many additional traction power substations, as the resistive losses are much higher due to this. it won't shock you as much as the overhead lines you're referring to - but if you touch a live 1,500 amp electrified rail, you will become a burnt marshmallow at the speed of light
it is the potential between the 3rd rail and earth that kills you and btw normaly the running rails are earth potential anyways so you can touch them and be safe (atleast in germany on mainline)
yes they do but the neutral conductor is earthed so nothing happens when you step on or touch the main running rails even if a locomotive is running over them
@@SimonBauer7 You mean the neutral is at ground potential so there's no difference between you and the rail you step on or touch. Touching both rails however can be a bit of a problem since some forms of security use a voltage between them that can bite, maybe not be lethal, but still. Since it's difficult to reach both rails with some gauges of track that's not that much of a concern, and snow or heavy rain typically doesn't affect this functionality. This type of track security relies on the rails getting shorted out by a train upon entering that track section, basically.
Well his diagram is WRONG. He say the rails are insulated amd shows a wheel on it. The running rails that the train runs on are not insulated. The third rail that the collector shoe runs on does sit on porcelain insulators otherwise the current would short to ground.
I think I once read about a third rail system that used split potential to be capable of lowering costs of insulating the single supplying rail and was also meant as an idea against corrosion or something. As you can probably understand (since you noticed the same thing I did) that has eh, it's problems when something goes wrong. If I recall correctly this system was used in England and has been phased out reasonably quickly because of the infrastructural nightmare stuff like switches and junctions were to design around 2 rails carrying a voltage, along with insulators going bad and causing stray currents...
Yep, spotted that straight away. Running rails will never be insulated - it would be extremely dangrous if they were. as the whole body of the train could reach live rail potential. You wouldn't notice until you tried to get on or off and had one foot on the train, one on the ground. Then it would be game over.
Next to platforms, it's typically situated as far away from passengers/the public as possible, so should someone fall onto the tracks and be conscious enough to find the suicide pit underneath the platform should a train arrive, there's no chance of meeting the third rail while on your way there. Not sure where you are but there's a multitude of different third rail systems out there, some, like in The Netherlands having the third rail be up in the air by about 30 centimeters and covered left, top and right by a glassfiber cover (I was once told by an employee of the metro system that while they are taught it's an insulator, due to all the dust that builds up on them he doesn't automatically trust their full insulating potential in emergencies, and worded it like this "Probably safe to step on with shoes on, but touching the protective cover? Nope, not me.") The pickup picks up current from underneath the rail. Some other countries have the third rail in the middle of the tracks, sometimes covered (and a train has to "catch" a sleeve like opening in order to touch this rail) and sometimes uncovered. There's the type in England which is slightly raised, sitting right next to one of the 2 pieces of rail (usually on the outside), and Amsterdam used to have a combined system with a third rail operation till a particular station, at which the metro converted to fast-tram service by switching on their pantograph (there was overhead wiring at that station) and retracting the steps on the sides, because the platforms of the fast-tram service were more narrow. Since this fast-tram service also had a huge amount of street-level crossings with pedestrian, cyclist and car traffic, third rail was obviously not an option there.
750 VOLTS! Dude get on my leve, I've been shocked with MORE THAN 1KILOVOLT. I made a taser that outputs more than 700 volts, You can even get 2,5 KILVOLTS from a microwave transformer
Most people are confused regarding the difference between volts, amps and current. He's either dumbing it down for them or doesnt know the difference himself.
Yeah. If ElectroBoom taught me anything it's that the voltage doesn't really matter as much as the amps when it comes to the dangers of electricity, right?
You were getting a discharge voltage and very SMALL current. IE a charged, disconnected capacitor. The third rail is powered by a DC generator or an AC Altenator that can deliver THOUSANDS of amperes of current! It is potentially a made made lighting bolt, when there's a short circuit! You can experience a tingling from a lightning bolt depending on the distance from it and the conductivity of the earth you are standing on. When you get a direct hit you will be VAPORIZED in many instances!
Don't forget that (depending on the system) the 3rd rail is typically has 600-800 volts going through that rail and most systems never shut down the 3rd rail if the train isn't there so even if the train isn't there the 3rd rail will kill you instantly.
That’s nothing, Montréal has 25,750 volts on their tracks.
@@lagoontejeraneasea1338 nobody cares u can literally die from either one 💀 it’s not a competition.
@@lagoontejeraneasea1338 On a third rail, or an overhead wire? I'd think a third rail at that high a voltage would just flash over to ground.
@@lagoontejeraneasea1338 you are misinformed on how electricity works. the 25,750 volt lines you are referring to are overhead lines, away from the ground / pedestrians. electrified third rails must use very high amperage with relatively low voltage, in order to minimize the high potential for electric arcs through the air that low to the ground, which can happen with high voltages. therefore, they often run at 700-800 volts, but upwards of 1,500 amps. this requires many additional traction power substations, as the resistive losses are much higher due to this. it won't shock you as much as the overhead lines you're referring to - but if you touch a live 1,500 amp electrified rail, you will become a burnt marshmallow at the speed of light
@@soundspark exactly
1:38 Don’t try this at subways
I never lived in the city and I learned something new about subways in general.
What makes 3rd rails so dangerous: Touch = zappy zap
U could stand on it and not be electricuted
it is the potential between the 3rd rail and earth that kills you and btw normaly the running rails are earth potential anyways so you can touch them and be safe (atleast in germany on mainline)
This is why I stand in the middle of the platform, bear hugging a pillar.
How about keeping your ass on the platform!
That one coworker that will always throw you under the bus is this guy.
Does overhead lines return current through the rails as well?
Yes, hence only one wire above instead of two, like rubber tired trolley busses
yes they do but the neutral conductor is earthed so nothing happens when you step on or touch the main running rails even if a locomotive is running over them
@@SimonBauer7 You mean the neutral is at ground potential so there's no difference between you and the rail you step on or touch. Touching both rails however can be a bit of a problem since some forms of security use a voltage between them that can bite, maybe not be lethal, but still. Since it's difficult to reach both rails with some gauges of track that's not that much of a concern, and snow or heavy rain typically doesn't affect this functionality.
This type of track security relies on the rails getting shorted out by a train upon entering that track section, basically.
Nyc subway train used to for DC presentation
Helpful, Cheers!
Was Interested About This (Still Am)!
Well his diagram is WRONG.
He say the rails are insulated amd shows a wheel on it.
The running rails that the train runs on are not insulated.
The third rail that the collector shoe runs on does sit on porcelain insulators otherwise the current would short to ground.
I think I once read about a third rail system that used split potential to be capable of lowering costs of insulating the single supplying rail and was also meant as an idea against corrosion or something. As you can probably understand (since you noticed the same thing I did) that has eh, it's problems when something goes wrong.
If I recall correctly this system was used in England and has been phased out reasonably quickly because of the infrastructural nightmare stuff like switches and junctions were to design around 2 rails carrying a voltage, along with insulators going bad and causing stray currents...
Yep, spotted that straight away. Running rails will never be insulated - it would be extremely dangrous if they were. as the whole body of the train could reach live rail potential. You wouldn't notice until you tried to get on or off and had one foot on the train, one on the ground. Then it would be game over.
The nail just caught on fire…
Came here after the paddington video
long story short, dont touch it
so this is why i didnt see a third rail when i looked between the tracks
Next to platforms, it's typically situated as far away from passengers/the public as possible, so should someone fall onto the tracks and be conscious enough to find the suicide pit underneath the platform should a train arrive, there's no chance of meeting the third rail while on your way there.
Not sure where you are but there's a multitude of different third rail systems out there, some, like in The Netherlands having the third rail be up in the air by about 30 centimeters and covered left, top and right by a glassfiber cover (I was once told by an employee of the metro system that while they are taught it's an insulator, due to all the dust that builds up on them he doesn't automatically trust their full insulating potential in emergencies, and worded it like this "Probably safe to step on with shoes on, but touching the protective cover? Nope, not me.")
The pickup picks up current from underneath the rail.
Some other countries have the third rail in the middle of the tracks, sometimes covered (and a train has to "catch" a sleeve like opening in order to touch this rail) and sometimes uncovered.
There's the type in England which is slightly raised, sitting right next to one of the 2 pieces of rail (usually on the outside), and Amsterdam used to have a combined system with a third rail operation till a particular station, at which the metro converted to fast-tram service by switching on their pantograph (there was overhead wiring at that station) and retracting the steps on the sides, because the platforms of the fast-tram service were more narrow.
Since this fast-tram service also had a huge amount of street-level crossings with pedestrian, cyclist and car traffic, third rail was obviously not an option there.
The 3rd rail is the furthest one from the platform and usually not between the running rails
NO PADDINGTON, THE THIRD RAIL
esseyez connecter 6 chauffeur de pelous en series. Ils marcheraient tres bien.
There are lots of debris around the track, trash from the homeless.
Just like the demon core.
*DO NOT TOUCH IT.*
I agree with the news
Exposed live voltage.
And....?
@@mlrd6622 zap zap dead burnt
750 VOLTS! Dude get on my leve, I've been shocked with MORE THAN 1KILOVOLT. I made a taser that outputs more than 700 volts, You can even get 2,5 KILVOLTS from a microwave transformer
Most people are confused regarding the difference between volts, amps and current. He's either dumbing it down for them or doesnt know the difference himself.
Yeah. If ElectroBoom taught me anything it's that the voltage doesn't really matter as much as the amps when it comes to the dangers of electricity, right?
You were getting a discharge voltage and very SMALL current. IE a charged, disconnected capacitor. The third rail is powered by a DC generator or an AC Altenator that can deliver THOUSANDS of amperes of current! It is potentially a made made lighting bolt, when there's a short circuit!
You can experience a tingling from a lightning bolt depending on the distance from it and the conductivity of the earth you are standing on. When you get a direct hit you will be VAPORIZED in many instances!
@@leehansen4750 the current is actually high as well as voltage.
@@MrDlt123 it was high voltage with high current