 He made a total of 13 appearances in his first professional season with Rangers and continued to make progress the following season, playing in 12 of Rangers' 41 matches.He became a regular in the Rangers team following the suspension of Willie Woodburn and George Young changing position to compensate.In 1955–56 Caldow made 35 appearances, mostly at right back, as Rangers won the League title for the first time in two seasons.