The goggles also track speed,
vertical distance traveled and air time, which is probably what most buyers will be interested in.
One problem might be that climbing slopes is not what trains are good at, while it is
the vertical distance travelled that matters.
Not exact matches
The landslide, from top to bottom, fell 2,790
vertical feet, but its runout — the
distance the slide
traveled — was almost 10,072 feet, or just less than two miles.
Re 392 Chris Dudley — while it makes intuitive sense that a spatially - invariant net photon flux could be sustained by a constant gradient in local equilibrium photon concentration (proportional to T ^ 4 for a grey gas, assuming constant real component of index of refraction), the calculation of what that gradient should actually be is made a bit more complicated by the fact that photons
travelling in different directions will on average be absorbed over longer or shorter
vertical distances.
So, if you can use the airship's ability to do a
vertical landing in or near the locations you really want to get to or from, then you have a good shot at reducing the total point - to - point
travel time enough to make the airship quite acceptable for short
distance air
travel.
If you plan to do a lot of work on your computer, make sure the keyboard offers solid tactile feedback, plenty of
vertical travel (
distance the key goes down when pressed, usually 1 to 2 mm) and enough space between the keys.