SAN FRANCISCO (CBS SF) — Passengers at the 24th Street/Mission BART station in San Francisco may be keeping an eye out for friends of an unwelcome visitor to the train platform.

Video posted recently on YouTube shows a large rat riding the down escalator. It was posted by user “boxdabunny” on February 9.

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In the video, the hefty rodent bounces up the escalator as it nears the platform. It was unknown whether the rat ever made it onto a train.

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Some Bay Area Rapid Transit stations have attained notoriety for their often filthy conditions.

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BART released a survey in January showing customer satisfaction at a 20-year low. The agency is also wrestling with a slump in ridership and is considering options to make up for the lost revenue, including service cutbacks.