sentences:  Walker, Vinny Castilla, and Andrés Galarraga each hit at least 40 home runs.Walker led the NL in home runs with 49 and OBP (.452), and the major leagues in on-base plus slugging (1.172), while Galarraga led the NL in runs batted in (140).The Rockies commenced the 1997 season on the road.