Travelled from MRJ to LTT. No vendors come to take your orders or even to sell any food onboard. There are some local vendors at MRJ station itself but those options too get toned down because this train arrives at PF3. So the best option is to order from various e-catering services. I personally had ordered aloo paratha and roti+paneer subji combo from Travelkhana and the food was really good plus served hot. So if you're traveling from MRJ I'd strongly recommend you to order from Travelkhana!