November 1st marks the expiration date of the contract between SEPTA and unionized employees of the City Transit Divison. These employees are represented by Transport Workers Union (TWU) Local 234. Negotiations are occurring, but no agreement has been reached. Union officials have indicated that a strike would occur without a tentative agreement prior to the contract expiration. The atmosphere surrounding labor negotiations can be extremely fluid, however, and circumstances can change with limited advance notice.
This Link — 2016 Service Interruption Information — details current SEPTA plans in the event of a strike. As the situation develops, the information on the SEPTA website may be updated. Riders are advised to remain aware of changing conditions that may occur without notice. The Suburban Transit and Regional Rail divisions will continue to operate, but may be impacted by extra passengers and TWU activities.
Non-SEPTA operators (PATCO, NJ Transit, etc.) should not be impacted.
This PlanPhilly article — SEPTA publishes Service Interruption Guide to ready transit riders for looming strike — contains additional information.