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Comment by JoshTriplett | Hacker News Reader

> They are very loud

Loud and sometimes vibration-inducing. But this seems potentially feasible to mitigate through sound insulation (both on the train and on the buildings; frankly, our buildings should have a lot more sound isolation than they do).

https://news.ycombinator.com/item?id=39401709 mentions newer elevated trains generating less noise, by designing for that requirement.

> they bathe streets/sidewalks/buildings in permanent shade

And permanent rain-cover. Seems like it'd often be a feature for many, though a bug for others.

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I live next to a bridge in NYC that carries trains, so I have experience here.

The set back from the bridge to my building is about 5-10x as far from my window as an elevated train line running on an avenue would be.

I have new windows, plus a second set of quiet windows installed within the windows. Essentially quadruple pane windows. It makes them unusable for ventilation. Plus I have sound deadening curtains, sound dampeners on walls, etc.

Believe me, it is loud. There is no mitigation you can do to make it not noticeable. You can only make it tolerable. The cost to get it to that level is not insignificant.

In an ideal world, housing wouldn't be built immediately on major transit lines, but a (walkable) short distance away. Alas, city planners seem dead-set that new construction must _only_ happen within a block of major roads or train lines. There seems to be a lot of urban malpractice that prevents us from making good choices.

In an ideal world, housing is built directly above transit stations, so people can get on the train without even having to go outdoors, leaving it the most obvious choice for almost all journeys.

Look at what they've achieved with this in Hong Kong. Plus the lines and stations basically pay for themselves due to revenues from residential property.

it seems to me elevated trains are a lot quieter running on concrete structures than on steel, as in NYC and Chicago.

It's not apples to apples (light rail + heavy), but from experience the elevated parts of LA's Expo Line are a lot quieter than the Chicago L.

There is mitigation that can be done for the noise. However it isn't something you can do - the city would have to rebuild the tracks to modern standards.

The rain cover is really outweighed by shade/lack of sunlight. The shade tends to make the street level experience more gloomy and a significantly worse experience that people tend to avoid.

Maybe with climate change and more brutal summers that calculus will change.

Hotter weather may change some of that but street level tends to be dark and not pleasant to be in. Like it or not, people tend to associate those areas with higher crime and the shops at street level tend to get noticeable less traffic. It depends on the size of the tracks but if you've been to the loop in Chicago or in places in NYC with elevated trains, the difference in the streets with elevated tracks and the streets without are noticeable.

And there's something to be said for giving residents and visitors spectacular views of the city.

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