now do high speed rail..
Assuming 1mpg for the entire train, it needs at least 100 passengers to compare to a fully-occupied passenger plane.
The point is that it makes air travel ludicrous from an energy perspective where rail at high speeds (200mph) is possible
There's nothing special about HSR when considering fuel (or energy) efficiency, except that it's probably less efficient over all due to increased air drag, and that it needs very particular infrastructure and passenger demand to make it work.
I'd hazard a guess that many (most?) flight routes are nowhere near popular enough to make them viable for train replacement.
Eg. The bullet train in Japan has a peak capacity of over 20,000 passengers per hour.
The most popular flight route in the US has around 3 million passengers per year, or ~340 an hour.
Train travel is so efficient that running nearly empty trains is just accepted.
Passenger capacity is part of the design of air travel. Even so, a plane could be at 1/3rd capacity before it's less efficient than a singly-occupied car.
Trains are largely a relic of the Industrial Revolution - except for those places where population distribution has made it feasible to invest in specialised passenger rail, the degree of infrastructure investment required makes them economically infeasible given a blank slate today.
If we were really concerned about transport efficiency, long-distance bus routes are the answer. Per-seat energy usage is comparable to trains, but with a fraction of the infrastructure cost, and significantly more flexibility. Countries that have a blank slate and are only interested in maximum transport for minimum cost (ie, the developing world) have gone that way for a reason.
We accept nearly empty trains, despite them needing at least 30 passengers to be competitive from a fuel efficiency standpoint with a singly-occupied car, because trains are largely seen as a service. Very few passenger trains are economically viable without government support.
It’s like a drain and the usefulness of the forum is swirling around and largely depleted
The interesting problem for tomorrow’s internet is how to automatically root out this nonsense. That’s a browser addin / AI tool that would be useful. Take the comments and probabilistically score the nonsense factor. A new PageRank if you will.
The value is in the well trained bullshit detector. One that could have read the parent comment on everyone’s behalf and saved us all the bother.
Let the corporate/pr/oil industry shills exist in their own space, and enable legitimate discussion to continue
However, your premise is that "people must use (I assume, electrified) HSR to stop burning oil". This is an entirely different discussion. In many ways, it is significantly less efficient when looking purely at an energy usage perspective, especially when considering new routes across sparsely-populated expanses with relatively low demand.