SAN FRANCISCO (KCBS) — KCBS has learned that union leadership representing San Francisco Municipal Railway employees has advised all Muni drivers to go back to work.

This latest development comes on day two of a Muni worker “sickout” that has left half of Muni’s vehicle fleet out of service and riders facing major delays citywide.

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Only half of 600 Muni vehicles were operating Tuesday morning, according to agency spokesman Paul Rose.

The agency added an additional 100 vehicles to the system but notified commuters to expect service disruptions.

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SFMTA was advising customers to find alternative means of transportation and visit SFMTA’s website to find out which rail lines and bus routes will not operate Tuesday. For real-time updates, customers can also follow Muni on Twitter.

Muni operators voted Friday on a proposed labor agreement. Officials with the employee union Transport Workers Union Local 250-A made no recommendation on the contract proposal, but it’s clear they’re unsatisfied with SFMTA’s offer.

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Its 2,200 operators represented by Transport Workers Union Local 250-A rejected the contract by a 1,198 to 42 vote Friday, according to totals on the union’s website.