Hi
Thank you both for your replies.
There is even more elevated railways approaches in the following
Wikipedia page.
All of there structures as bridges, they have a common issue is that they are very expansive and because of that they are built in short distances mostly in heavy density of populations. Bridges are very high, and it is known in the civil engineering that mush the structure is higher, mush it has to be more thicker, more stronger this needs more volumetric materials so expansive building. So this approach of bridge is not a solution for entire railroad for hundreds of miles.
The approach of
HiGH Railways resolve the problem of expansiveness, it is possible to build longer railroads up to hundreds of miles with a minimal possible costs. That is because the lifting columns which are made of reinforced concrete as example are positioned first during the long path, those lifting columns or (
Lc) has to be 2.3 meters in high in general, then the rails will be mounted on top of these columns.
The lifting columns will be built in a factory and transported by trucks into the way path. The costs of production of those lifting columns can be calculated for the following scenario :
Lifting column dimensions (x,y,z) in meters : (0.5, 1.7, 2.3)
Volume of
Lc : 0.5*1.7*2.3 = 1.95
m3 (meter cube)
Distance between two successive
Lc : 10 meters
Type of used materials : Reinforced concrete synthetic fibers
Price of used materials : 24.50
Euro/
m3
Typical resistance : 60
N/
mm2
Normal resistance toward weights : (0.5*1.7*1000*1000)*60 = 51 millions Newtons
Price of one lifting column : 1.95 * 24.5 = 47.775
Euro
For 100 kilometers, we need on average 9524 lifting columns so the cost of them would be : 455,009
Euros
This is reasonable and not expansive. A resistance of 50 millions newtons is more than enough for heavy trains.
The secret behind that are those special cheap reinforced concretes which provides very powerful features
Best Regards