By CBS3 Staff

PHILADELPHIA (CBS) – Talks continue on Tuesday between SEPTA and its biggest union. If both sides don’t reach a deal by Halloween, workers say they’ll walk off the job as early as Monday morning.

Sources tell Eyewitness News talks went well on Monday between SEPTA and TWU Local 234.

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The union voted to authorize a strike if no deal is reached by midnight Sunday. A strike could affect not only commuters but thousands of students.

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The School District of Philadelphia says it is working on a strike plan and hopes to release it by Thursday.

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SEPTA has released a guide in the event of a service interruption, for everything you need to know click here.