Granite Rock Company No. 10 is an 0-6-0 steam locomotive built in 1942 by H.K. Porter for the Granite Rock Company.

The engine was used for Granite Rock Company as a switcher.

After World War II, Granite Rock bought the engine from the Army Corps of Engineers and put it to work hauling rock from the company’s quarry near Watsonville, until it was replaced with a General Electric diesel switcher in 1951.

Granite Rock’s late President and CEO Bruce Woolpert had the rusty, broken engine restored to full working order in the 1990s and donated it to the California State Railroad Museum in May 1997.

As of today the engine is at the California State Railroad museum.


  • As of April 11, 2015 the engine is back in service after a 4 year restoration.
  • Engine No. 10 was also featured in Steven Spielberg’s 2005 movie, Memoirs of Geisha.