Question

This train is bound ----- Delhi(put it preposition) to/upon/for

Answer 1

the train is bound to delhi

Answer 2

This train is bound --to--- Delhi. It is a preposition.

A preposition is a word used to interface things, pronouns, or expressions to different words inside a sentence.

They act to interface the general population, items, time and areas of a sentence.

Preposition are typically short words, and they are ordinarily put specifically before things.

Now and again, you'll discover relational words before "ing" word action words.