As more LIRR union workers vote on whether to go on strike as soon as Sept. 18, the MTA is ramping up plans for a possible shutdown of the nation’s largest commuter railroad, including setting up buses to shuttle commuters to Queens subway stations, officials said Friday.

Members of least two unions involved in the ongoing contract dispute — the Brotherhood of Locomotive Engineers and Trainmen and the International Brotherhood of Electrical Workers — began to cast their ballots this week for a possible strike. Two other unions, the Transportation Communications Union and the International Association of Machinists, already approved a possible strike last month.

Asked whether his union would hold a strike vote, Michael Sullivan, general chairman of the Brotherhood of Railroad Signalmen, w

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