A coalition of school bus companies plans to stop service to 150,000 city students and fire 12,000 unionized workers in a vicious contract standoff, The Post has learned.

The coalition will inform the state Monday of its plan set to take hold Nov. 1 as part of a state requirement that dictates companies must notify the state Department of Labor ahead of layoffs under the Working Adjustment and Retraining Notification (WARN) laws.

Bus companies Logan, Transportation Corp., Consolidated and Pioneer Transportation saw their contracts with the Big Apple end in June and have been given month-to-month emergency contracts ever since. 4

“Without a contract the company cannot commit to the purchasing of buses and long-term leases necessary to continue its services,” a draft letter to the

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