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Indian Railways Institute of Civil Engineering: Forums

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S. Chandrahas
Sr.Section Engineer(DRG) S.C.Rly.

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PostPosted: Thu Feb 27, 2014 12:56 pm Back to top

What should be the minimum distance between two grade posts in the longitudinal P-way section. for example, the minimum length of intermediate grade between 1 in 100 grade and 1 in 200 grade,Kindly justify.

S.Chabdrahas, SSE/Drg/SCR
            
            
            
- S. Chandrahas Sr.Section Engineer(DRG) S.C.Rly. ... 27-02-14

Sanjay Chawla
DGM/Engg/DFCCIL

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PostPosted: Mon Mar 24, 2014 5:13 pm Back to top

Two vertical curves should be designed and these may be placed side by side with common tangent points like in horizontal curves. I suppose, minimum distance between two vertical curves is not specified.
            
            
            
- Sanjay Chawla DGM/Engg/DFCCIL ... 24-03-14

Ramamurthy C
Railway Track Design Engineer

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PostPosted: Tue Mar 25, 2014 10:31 pm Back to top

A normally followed practice, I have come across and applied is that distance between two consecutive grade change points (Vertical Intersection Points) shall not be less than one train length i.e., a train shall not be on more than one change point at any time. Of course, there will be deviations in locations line major bridge approaches and other difficult locations.
            
            
            
- Ramamurthy C Railway Track Design Engineer ... 25-03-14

A. Gunashekar
ADEN

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PostPosted: Tue Mar 25, 2014 10:57 pm Back to top

In the formation designed by Britishers for 70 kmph we are running the trains in 140kmph.
We should adopt the formation designed by Chinese for >250 kmph for running the trains at >500 kmph in the next century.
            
            
            
- A. Gunashekar ADEN ... 25-03-14

Sushant Kumar Sahoo

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PostPosted: Mon Apr 14, 2014 6:42 pm Back to top

No such stipulation is available till date in writing in Indian railway .However it is to be decided by accomodating vertical curves .the provision of one train length is not mandatory ,when other specifications of vertical curve and grade compensation are fulfilled.
            
            
            
- Sushant Kumar Sahoo   ... 14-04-14
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