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Civil Engineering/Modeling a Single Train running on three rails.


Train running on two rails
Train running on two r  
Dear Babak

Will there be advantages in modeling a train running on three rails instead of two rails ?.

I Feel the advantage would be carrying more people capacity for a compromise of Train manufacturing cost incurred.

All Trains run on two rails. Now the same train will be running on three rails.

Merits : Length and Height of the train remains the same, adding a new rail 3 for the single train will result in increase of train width. Now the Load (People, Luggage) carrying capacity will increase. i.e. More People can commute / travel in the train.

Demerits : Manufacturing cost = Raw Materials cost + Labour cost. Manufacturing cost for the New Train construction to run on three rails will increase.

Awaiting your reply,

Thanks & Regards,
Prashant S Akerkar

Dear prashant

I think that the problem is not to increase the number of rails. I think that in fact only 2 rails will carry the load of train because of errors and deflections. The 3rd rail cant be loaded unless the design of train mechanism ( springs ) is so that the deflection of one rail support doesn't remove the rail as a support. I guess a train will be  vulnerable under oscillations due to rail imperfections if it is provided with  soft springs.


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Babak Esmailzadeh Hakimi


I can answer questions in Structural Engineering, Earthquake Engineering, Project Management and Project Control topics!


I am experienced in the area of earthquake engineering in electrical power industry, i.e. Lifeline Earthquake Engineering. My focus has been on structural seismic design of power installations. Recently I have got involved in project management in the category of constructional engineering.

Sinam Consulting Engineers Co.

Bs degree in Civil Engineering from Ferdowsi University ,1988, Mashhad Iran, Ms degree in Earthquake Engineering, Sharif University of Technology, 1993, Tehran, Iran

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