The Walden Street Cattle Pass, also referred to as the cow path,[2] is an historic site adjacent to the MBTA Commuter Rail Fitchburg Line right-of-way, under the Walden Street Bridge in Cambridge, Massachusetts.

The site, a tunnel for moving cattle between the railroad and the nearby stockyards of the 19th century, was built in 1857.

[4] Restoration (re-pointing) of the tunnel's brickwork was carried out during the 2007–08 replacement of the second-generation bridge dating from 1914.

The Cambridge City Council discussed creation of a vantage point for viewing the tunnel, ca.

This article about a National Register of Historic Places listing in Cambridge, Massachusetts is a stub.