"We do it based on experience, based on when we've had difficulties….when we're going to be inundated with a lot of people under 21, or maybe just over 21, where they've created problems in the past," LIRR spokesman Salvatore Arena told DNAinfo.
Of course, this year, SantaCon starts at 10 a.m. in Tompkins Square Park... meaning SantaConners arriving via LIRR in the early morning won't be impacted by the ban. So there can be booze business as usual.
Metro North and New Jersey Transit have also issued a temporary ban on alcohol this weekend, per Business Insider.
MTA police officers will be patrolling Grand Central Terminal, Penn Station, and other stations, it said. They will confiscate illegal liquor, and those caught drinking can face fines up to $50 or 30 days imprisonment.