CANADIAN PACIFIC 4-6-4 HUDSON NO. 2816 is in fine form on May 9, 2024, as she accelerates along the Canadian Pacific Kansas City main line on the outskirts of Elgin, Ill., en route from Calgary, Alberta, to Mexico City in celebration of the CP-KCS merger. Photographer Larry Gross was in the passenger seat and Jason Hilsenbeck was at the wheel when serendipity struck along Route 31. In this pace shot, the 1930 Montreal Locomotive Works product is all business: Attentive crew, clean stack, rods and 75-inch drivers ablur, and 45,254 pounds of tractive effort urging the train toward the Quad Cities. But the Empress, as she’s dubbed, is a study in elegance, too: The polished brass bell, spotless gray boiler and cylinder jackets, and Tuscan Red sash along the running…