The correct answer is A. 1 in 8.5.
A turnout is a railway track device that allows trains to move from one track to another. It is also known as a switch or a frog. Turnouts are typically made up of two rails that are joined together at a point called the frog. The frog is what allows the train to cross from one track to the other.
There are many different types of turnouts, but the most common type used for goods trains on Indian Railways is the 1 in 8.5 turnout. This type of turnout has a frog angle of 11 degrees and a crossing angle of 14 degrees. The 1 in 8.5 turnout is a very versatile turnout and can be used in a variety of applications. It is also a very reliable turnout and has a long lifespan.
The other options are not as commonly used for goods trains on Indian Railways. Option B, 1 in 12 turnout, is a less common type of turnout. It has a frog angle of 10 degrees and a crossing angle of 12 degrees. Option C, 1 in 16 turnout, is an even less common type of turnout. It has a frog angle of 9 degrees and a crossing angle of 16 degrees. Option D, 1 in 20 turnout, is the least common type of turnout. It has a frog angle of 8 degrees and a crossing angle of 20 degrees.
The 1 in 8.5 turnout is the most commonly used type of turnout for goods trains on Indian Railways because it is a very versatile and reliable turnout. It can be used in a variety of applications and has a long lifespan.