Can carry but can't consume..
Yes, as long as you don't consume on the train.
Yes, all answers listed are correct. Bring cooler, but no consumption on trains.
Yes u can just as long as your not eating or drinking on the train or literail...
I think yes, aเด long as you are not eating inside the train.
I don't see an issue with it. The signs at the station warn not to eat or drink while on the train, but if you're just carrying it inside a cooler it should be just fine.
Thanks! Your answer is awaiting moderation.