One bar manager said the anti-consumerist fest had repeatedly trumped St. Patrick's Day in bar sales.
LIRR administrators opted for the booze ban "based on experience," a spokesman said.
The annual costumed bar crawl will begin in Tompkins Square Park, officials said.
State and city leaders called on event organizers to adhere to three guiding principles next month.
Last year, residents complained of bad Santas terrorizing the West Side.
Sources said one intoxicated Santa cursed at kids after being arrested during SantaCon.
SantaCon 2012 will follow a planned route from Midtown to Williamsburg on Saturday.
DNAinfo has gathered some of the best photos from 2011, from Osama bin Laden's death to gay marriage.
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