Lyric discussion by thujone 

From the "Black Maria" wikipedia page

Black Maria may refer to:

Black Maria, a slang term for a police van used to transport prisoners, originally these were horse drawn and so could take some time to arrive at a crime scene. “Black Maria” was a famous racehorse of the day, born in Harlem USA in 1826. The name was sardonically applied to the police carriages (which were also usually colored black). Black Maria, the name of the truck that stops to aid the lone survivor in the film The Texas Chain Saw Massacre. Edison's Black Maria, a film studio created by Thomas Edison

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