Uh, what? You absolutely can run trains on elevated tracks. Japan does it all the time. So do many other cities and countries. If you want to get real fancy, mag-lev runs almost exclusively on elevated tracks. Where did you get the impression that you can’t elevate train tracks?
Of course you can elevate trains, but it requires an extremely gradual slope. Trains are meant to be almost perfectly level with the ground, so it might take a mile of tracks to raise the elevation even a foot safely.
the 11 foot 8 bridge (which was recently raised to 12ft4in of clearance) was designed to car standard, not to train standard. it was also designed in the 1920s, when the standard for cars was lower. it has nothing to do with the grade trains are on.
I live next to a literal over-under bridge for freight trains where two tracks cross over eachother in order for freight yard operations to not block passenger rail.
Yes, it is totally possible to raise and lower the levels of train tracks, but it takes lots of logistics and a long path of gradual elevation change to arrange all that.
You’re not really saying much by pointing out they raised 11foot8 to 12foot4, a whole whopping 8 inches. And it took them how long and how much money to do even that?
I’m not sure what your trying to argue here. Elevate rail lines already exist. It’s not something theoretical that people think can be done, it already exists. The engineering problems have been solved. Google it if you don’t believe me.
It’s not about the engineering problems, it’s about the financial and economic problems. Trains aren’t meant to change elevation quickly, meaning they’d have to rip up a couple miles of train tracks both ways and build a train rail bridge to even start to make an elevated track.
See, trains can’t go up and down random hills, they require mostly level tracks. And when they elevate the tracks, they gotta design in a mile or three of gradual slope tracks to keep everything safe.
For light rail, they usually don’t bother trying to go up and down for every crossing, they just elevate the whole thing. Easier to move people up and down at the stations.
Light rail is just that: it’s still trains, but they are orders of magnitude lighter, since all you are moving are people. After some quick Googling, freight trains can be a mile long and weigh 20,000 tons, while a light rail train may only consist of 5 cars, totalling somewhere around 200 tons. The track you need to support freight trains is very much overkill for public transit.
Now there are heavier public transit trains that are designed to run on existing freight rail lines, but when people talk about trains for public transit, it’s usually light rail that they are thinking of. Unless they are talking about high speed trains, which also require their own dedicated tracks.
They’re not planning on building new rails. Matter of fact, they’re busy doing minor patches on the existing freight rails to dual-purpose them as passenger rails.
So they are cheaping out, doing the least amount possible while still being able to say they “did something”. This is not what people are usually talking about when they advocate for trains as a public transit solution, but unfortunately, it’s what we tend to get.
Uh, what? You absolutely can run trains on elevated tracks. Japan does it all the time. So do many other cities and countries. If you want to get real fancy, mag-lev runs almost exclusively on elevated tracks. Where did you get the impression that you can’t elevate train tracks?
Guess you haven’t kept up with 11foot8
http://11foot8.com/
Of course you can elevate trains, but it requires an extremely gradual slope. Trains are meant to be almost perfectly level with the ground, so it might take a mile of tracks to raise the elevation even a foot safely.
the 11 foot 8 bridge (which was recently raised to 12ft4in of clearance) was designed to car standard, not to train standard. it was also designed in the 1920s, when the standard for cars was lower. it has nothing to do with the grade trains are on.
I live next to a literal over-under bridge for freight trains where two tracks cross over eachother in order for freight yard operations to not block passenger rail.
Yes, it is totally possible to raise and lower the levels of train tracks, but it takes lots of logistics and a long path of gradual elevation change to arrange all that.
You’re not really saying much by pointing out they raised 11foot8 to 12foot4, a whole whopping 8 inches. And it took them how long and how much money to do even that?
just pointing out that it’s not fixed and it’s not a good example anyway.
I’m not sure what your trying to argue here. Elevate rail lines already exist. It’s not something theoretical that people think can be done, it already exists. The engineering problems have been solved. Google it if you don’t believe me.
It’s not about the engineering problems, it’s about the financial and economic problems. Trains aren’t meant to change elevation quickly, meaning they’d have to rip up a couple miles of train tracks both ways and build a train rail bridge to even start to make an elevated track.
See, trains can’t go up and down random hills, they require mostly level tracks. And when they elevate the tracks, they gotta design in a mile or three of gradual slope tracks to keep everything safe.
For light rail, they usually don’t bother trying to go up and down for every crossing, they just elevate the whole thing. Easier to move people up and down at the stations.
Light rail? What’s the difference?
Where I’m at, the existing tracks are all freight rails, running through major industrial areas, for over 50 years, probably more.
I’ve never heard of ‘light rail’ before, and now you have me concerned, because they want to start using our freight rails for passenger trains soon…
So what the hell? What is a ‘light rail’?
Light rail is just that: it’s still trains, but they are orders of magnitude lighter, since all you are moving are people. After some quick Googling, freight trains can be a mile long and weigh 20,000 tons, while a light rail train may only consist of 5 cars, totalling somewhere around 200 tons. The track you need to support freight trains is very much overkill for public transit.
Now there are heavier public transit trains that are designed to run on existing freight rail lines, but when people talk about trains for public transit, it’s usually light rail that they are thinking of. Unless they are talking about high speed trains, which also require their own dedicated tracks.
They’re not planning on building new rails. Matter of fact, they’re busy doing minor patches on the existing freight rails to dual-purpose them as passenger rails.
So they are cheaping out, doing the least amount possible while still being able to say they “did something”. This is not what people are usually talking about when they advocate for trains as a public transit solution, but unfortunately, it’s what we tend to get.