The facility has become available on IRCTC's e-catering website since May 13, said IRCTC CMD AK Manocha.
The cash back offer is valid only for meals booked through IRCTC and having a value of more than Rs 300 in a single order.
Manocha said such a move would give a major fillip to e-catering operations of IRCTC.
"IRCTC's e-catering facility, which has broad-based the culinary choices in a significant manner, is now turning out to be a big hit with rail passengers. The 50 per cent cash back offer will further induce passengers to patronise our e-catering facility," he said.
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The cash back would be processed after the delivery date and the payment would be credited to the same account through which the order was made for the meal booking.
The customer would be informed once the cash back is processed by IRCTC.
Such an offer would also create awareness about e-catering and make IRCTC's e-catering website popular, Manocha added.