Why are subway tunnels so hot?
The heat from the friction of brakes is immense, and it has nowhere to escape to. Furthermore, all of the transformers on the subway cars, that convert the incoming electricity from the third rail into a usable current also generate significant heat in doing so.
Why is it so hot underground?
If you’ve ever wondered why the London Underground is so hot – especially as you’re sweating on your summertime commute – the surprising reason has been revealed. According to CityMetric, 89\% of heat of the tube comes from the tube itself, with things like friction from braking being a huge factor.
Why is it so hot in the Metro?
The heat in the tunnels is largely generated by the trains, with a small amount coming from station equipment and passengers. When the tunnels were built the clay temperature was around 14 °C; this has now risen to 19–26 °C and air temperatures in the tunnels now reach as high as 30 °C.
Is the NYC subway air conditioned?
“Ninety-eight percent of the 5,356 subway cars in service every day have working air conditioning, but nobody should suffer through a hot car in the summer, and we’re fighting hard against heat waves and an elderly fleet to fix those last few stubborn cars,” Lhota said in a statement to The Post Thursday.
Can subway tunnels collapse?
Just as the walls of a pipe need to be made strong enough to hold the pressure in the pipe without bursting, the walls of a subway tunnel need to be designed to take the pressure of the dirt and water surrounding them without collapsing.
Can you survive under a subway train?
So the answer is yes – it is possible to survive lying under the oncoming train, but it is very unlikely that you could survive that without a major injury. It is a good idea to stay away from railroad tracks. Sometimes trains can be rather quiet and very fast. You may get distracted or simply not notice it coming.
How hot is it 1 mile underground?
Geothermal gradient indicates that on Earth, 1 mile underground would be about 40-45 C (75-80F, just as you said) hotter than on the surface.
Does the ground stay warmer than the air?
Soil can hold heat better than air does. It is also insulated by soil above it, vegetation, and snow. In fact, the deeper you go, the more insulation and the higher the average temperature, to a point. From about 30 to 200 feet below the surface, the soil temperature is relatively constant (about 55 degrees F.).
How hot does the underground get?
“The temperature of the Earth down 20 or 30 feet is a relatively constant number year-round, somewhere between 50 and 60 degrees” F, says John Kelly, the COO of the Geothermal Exchange Organization, a nonprofit trade organization in Washington, D.C., that lobbies for wider adoption of the technology.
Where is the coolest place in the US during summer?
San Francisco
Cool summer temperatures can be found in major cities of the United States on the west coast and in the northeast. Among the country’s 51 largest cities, San Francisco tops the list for usually having the coldest weather each day in June, July and August.
Why does NYC subway smell?
-Creosote – the stuff that they soak the railroad ties in to preserve them. There are slight variations on what exactly it smells like, but overall, it smells the same. It’s a fairly strong odor, and over time, it will permeate the air in the subway. -Steel brake dust.
Do NYC subway cars have bathrooms?
“I can’t wait — and there’s no bathrooms in the subway.” All MTA-maintained subway bathrooms — covering 76 stations, 16\% of the entire system — have been closed for more than a year as part of the MTA’s efforts to stop the spread of COVID-19.