Above, a map of three roundhouses in Grand Rapids in 1907.  The GR&I roundhouse is in the bottom left.  MCRR's roundhouse is rear by (center) and the Pere Marquette 5th Street roundhouse is at the upper right.  The GR&I facility is the largest.  [Tom Mass Collection]  This was an early roundhouse for the PM, as a larger facility was built at Wyoming Yard.