The rail section used now-a-days in Indian railways is :

Explanation:

There are three types of rail sections:

Double-headed rail(D.H. Rails):

• These rails indicate the early stages of development.
• It mainly consists of three parts (a) Upper table (b) Web (c) Lower table
• Both the upper table and lower table were identical
• When upper tables get worn out, then the rails can be inverted and reused.
• This type of rail is practically out of use on the Indian railway.

Bull-headed rail(B.H. Rails):

• The next evolution was that of B.H. rails.
• It mainly consists of three parts (a) Head (b) web (c) Foot
• The Head has a larger size than the foot. So that even after wear, it can withstand stresses.
• The foot is designed only to furnish the necessary strength and stiffness to rails.
• Bull-headed rails are specially used for making points and crossing.

Flat-footed rail( F.F. Rails):

• It consists of three parts (a) Head (b) Web (c) Foot.
• The foot is spread out to form a base ( as the name Flat-footed suggests)
• About 90% of the railway track in the world is laid with this form of rails.
• In India, flat-footed rails are most commonly used.

Advantages of flat-footed rails:

• No requirement of chairs or keys.
• This form of the rail is stiffer both vertically and laterally than the full-headed rail of equal weight.
• Less liable to develop kinks
• Cheaper than the B.H. rails.
• Distributes the train load over a large number of sleepers.