Caption: T, H & B switchers No. 51 (NW-2; EMD January 1948) and No. 55 (SW-9; GMD December 1950) are shown performing their workaday duties at the Aberdeen Yard. Both are pioneering units; No. 51 the first T, H & B end cab switcher, No. 55 the first GMD built model on the roster. No. 51 was conveyed to Ontario Southland Railway in 1992 and is still resident in Salford, Ontario – see http://www.railpictures.ca/?attachment_id=10014. Following full acquisition of T, H & B by parent Canadian Pacific, No. 55 would depart the roster in 1988 and subsequently find work as an industrial switcher for a number of new owners – see http://www.thbrailway.ca. Note the detail differences between the two switcher models. Note also in the background on the right the massive concrete coal tower located at the Chatham Street locomotive service facility.