Rail :-
The Rails on the track can be considered as steel Girder For the purpose of Carrying axle Loads. They Are made of High Carbon Steel to withstand Wear & Tear. Normally Flat Footed Rails (FF) are mostly Used in Railway track specially In Indian Railways.
Standard Rails Used By Indian Railway As shown in below picture.
Functions of Rails :-
- Rails provide a hard ,smooth & unchanging surface for passage of heavy moving loads with a minimum friction between the steel rails and steel wheels.
- Rails bear the stresses developed due to heavy vertical loads, lateral and braking forces and thermal stresses.
- Rails transmit the loads to sleepers and consequently reduce pressure on ballast and formation below.
Types of Rails :-
- Double Headed Rails (DH)
- Bull Headed Rails (BH)
- Flat Footed Rails (FF)
Double Headed Rail :-
Uppar head and the lower head of the Rails have Same dimensions or upper table and lower table have same width is known as Double Headed Rails (DH).
Generally we use ;
- Total depth/height of the Rail = 152.5mm
- Width of both heads = 70mm
- Depth/height Of the both heads =44.5mm
- Depth/height of the web = 63.5mm
- Width of the web = 19mm
Bull Headed Rails :-
It name as indicates its lookes like bull head in one side. Because of the one head of rail is larger than another head.
Generally we use:-
- Width of head =68.7mm
- Depth/height head =46mm
- Width of Foot =63.5mm
- Depth/height of foot=33mm
- Total depth/height of rail =144.9mm
- Depth /height of web = 65.9mm
- Width of the web = 16.7mm
Flat Footed Rails (FF) :-
This type of Rails generally used in modern Rail way tracks, it is very Economical.
This type of Rails have flat in below side and traffic moving on upper side , or Have Flat type of Footing As shown in below picture.
Generally we use ;
- Upper side width =66.7mm
- Depth/height of the upper side =43.7mm
- Total depth/height of the Rail = 142.9mm
- Hight/depth of web =78.6mm
- Width of the web =13.89mm
- Width of flat foot =136.5mm
- Depth/height of the flat foot =20mm
