Hopefully, their tablets will have good responsiveness. Last time I've been to a restaurant with rail system + tablets for orders they were painfully slow and unresponsive. Simple action like checking previous orders took unreasonable amount of time which is not very comfortable when you have to keep your hand up in the air in order to touch a display (similar to the airplanes).
Nevertheless, that's a good decision and as stated in the article it should have general positive effect on resource use and waste.