It's sad that you're probably serious [LWN.net]

It's sad that you're probably serious

Posted Sep 23, 2011 19:34 UTC (Fri) by martinfick (subscriber, #4455)
In reply to: It's sad that you're probably serious by dlang
Parent article: Garrett: UEFI secure booting

> railroads are very expensive to build

I don't even buy that. They utilize way less land than roads do. Even a massive high speed rail is thinner than a small neighborhood road. The steel is likely the only really high ticket item.

You have to also think about what you are comparing. It is not fair to compare RRs designed for interstate freight traffic to local roads. If RRs were to be used for more local transportation, they would have scaled down by now to something that would not be recognizable as normal RRs. There would be much lighter weight rails than what is even considered light weight today. We would be using very small gauge rails to run through our neighborhoods. The cost of these would be significantly less than those of major RR lines today.

Oh, and it really doesn't help to use he word "public" in any of this conversation. Roads are just as public (or not) as rails/buses/trains. All are mostly funded by taxes. It is not a good differentiator when comparing transportation modes.

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It's sad that you're probably serious

Posted Sep 24, 2011 2:16 UTC (Sat) by dlang (✭ supporter ✭, #313) [Link]

railroads are far more sensitive to grade and unevenness than roads are.

don't discount the cost of the rails, over miles that really amounts to a large amount

also, all the control points where other traffic needs to get stopped to let the railroad go through cost

then you have the need to engineer specific places where the traffic can be redirected (switches, etc)

what makes railroads efficient to run is that they have very low friction, and as a result you can pull the same load with less power. As a result of having lower power for a given weight (and less friction with the tracks), trains accelerate slower than normal vehicles. due to less friction, they decelerate slower as well. As a result you want to avoid having the train make speed changes as much as possible

if you are going to stop frequently (and don't have a huge volume of passengers that need to fit in each vehicle), then dedicated busways (2 lane roads usable only by buses, with railroad like crossing guards) are actually cheaper, and the buses can leave the busways and use normal streets as well.