Question

How did he escape from the ticket collector?

Answer 1

Velu travelled in the unreserved compartment. The ticket collector did not come to that compartment and thus Velu was saved from the ticket collector's attention.

Answer 2

Velu escaped the ticket collector's notice because the ticket collect did not come to the unreserved compartment in which he was travelling. Velu stood on the platform but he felt "as if he was still on a moving train". So he felt he was still on a moving train.