Question

Rohit said I can catch the train

Answer 1

Rohit said that he could catch the train. hope it helps you

Answer 2

If you wish to convert it from direct to indirect speech, you're answer will be this.
Robot said that he could catch the train.

Here, 'that' comes as we need to refer to give a kind of commentary on what he actually said.
'Can' changes to 'could' as, according to the rules of reported speech, a sentence from direct to reported speech must change the tense, and here it is simple present (can) to simple past (could).

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