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(CityLab)   Texas company to replicate Japanese transportation system with 200-mph bullet train line connecting Dallas and Houston in hassle-free 90-minute trip   ( citylab.com) divider line
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1898 clicks; posted to Geek » on 20 Jun 2014 at 7:50 AM (3 years ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»

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2014-06-20 05:30:03 AM  
2 votes:

Trance750: Ore you can just hop on Southwest Airlines and beat the train by 45 minutes

I can tell you don't fly much.

Posted from O'Hare.
2014-06-20 12:53:06 PM  
1 vote:

AMonkey'sUncle: Will the summer Texas heat mess up the rails, or whatever it will run on? If tunnels, then never mind.

http://en.wikipedia.org/wiki/Track_%28rail_transport%29#Continuous_w el ded_rail
"Most modern railways use continuous welded rail (CWR), sometimes referred to as ribbon rails [...] Welded rails are more expensive to lay than jointed tracks, but have much lower maintenance costs. The first welded track was used in Germany in 1924 and the US in 1930[10] and has become common on main lines since the 1950s.

If not restrained, rails would lengthen in hot weather and shrink in cold weather. To provide this restraint, the rail is prevented from moving in relation to the sleeper by use of clips or anchors. Anchors are more common for wooden sleepers, whereas most concrete or steel sleepers are fastened to the rail by special clips which resist longitudinal movement of the rail. There is no theoretical limit to how long a welded rail can be. However, if longitudinal and lateral restraint are insufficient, the track could become distorted in hot weather and cause a derailment. Distortion due to heat expansion is known in North America as sun kink, and elsewhere as buckling. In North America a rail broken due to cold-related contraction is known as a pull-apart. Attention needs to be paid to compacting the ballast effectively, including under, between, and at the ends of the sleepers, to prevent the sleepers from moving. In extreme hot weather special inspections are required to monitor sections of track known to be problematic.

After new segments of rail are laid, or defective rails replaced (welded-in), the rails can be artificially stressed if the temperature of the rail during laying is different from what is desired. The stressing process involves either heating the rails causing them to expand,[11] or stretching the rails with hydraulic equipment. They are then fastened (clipped) to the sleepers in their expanded form. This process ensures that the rail will not expand much further in subsequent hot weather. In cold weather the rails try to contract, but because they are firmly fastened, cannot do so. In effect, stressed rails are a bit like a piece of stretched elastic firmly fastened down.

CWR rail is laid (including fastening) at a temperature roughly midway between the extremes experienced at that location (this is known as the "rail neutral temperature"). This installation procedure, along with normal track structure strength, is intended to prevent tracks from buckling in summer heat or pulling apart in winter cold. In North America, because broken rails are typically detected by the signaling system; they are seen as less of a problem than heat kinks which are not detected."
2014-06-20 12:47:29 PM  
1 vote:
img.fark.netView Full Size
2014-06-20 09:40:38 AM  
1 vote:
High-speed rail already works.  It's always just been just a question of how badly people want it.

People love it once they try it out.  Even the Acela, which is all hype.
2014-06-20 09:10:26 AM  
1 vote:
Federal government wants to build more train lines: NEVER UNDER ANY CIRCUMSTANCES
Private company wants to build more train lines: GIVE THEM FEDERAL FUNDING
2014-06-20 08:39:01 AM  
1 vote:

HawgWild: Why in the name of all holy would you want to go to Houston?!

Because you were in Dallas.
2014-06-20 08:36:54 AM  
1 vote:
This really sounds like more of a Shelbyville idea.
2014-06-20 08:35:59 AM  
1 vote:
Part of what makes the Shinkansen so successful is that the trains run every ten minutes or so -- it doesn't matter if you miss your train. Hard to see that frequency happening here.

And in general, the Japanese public transportation system in cities and between them makes the US look like a third world country.
2014-06-20 01:41:02 AM  
1 vote:

Trance750: Ore you can just hop on Southwest Airlines and beat the train by 45 minutes

If you want to get digitally raped by a fat black woman with a penlight, there's craigslist.

For everyone else, there's bullet trains.
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