The M&E has two locomotives numbered as No. 21. The first one is an ex SOO Line RS1, constructed during May 1953. The second No. 21 is a former Bangor & Aroostook, nee Santa Fe, GP7u that was recently purchased at the MN&A auction in Maine during the Summer of 2014. For a photo of the latest No. 21, see Railpictures image 507576