By Kristen Johanson

PHILADELPHIA (CBS) – The fourth day of the SEPTA strike is upon us.

The Transport Workers Union, which represents bus drivers, cashiers and trolley and subway operators — have been at the bargaining table with top SEPTA officials for days trying to hash out a deal.

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That includes Thursday when they began at 11:30 a.m. and lasted well into the night.

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No deal yet, but a SEPTA spokesman says it’s a positive that both sides are still talking and crunching numbers.

The main issue at the table now: pensions.

A mediator is working with the two sides trying to get all the employees off the picket line.

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SEPTA says if they file an injunction to get employees back to work for Election Day, the measure would be filed in the Court of Common Friday, but it’s a last resort as they want to continue talks and come up with a resolution.