In the following season, 1947–48, Cox was an ever-present as Rangers finished second to Hibs in the league, but won the Scottish Cup after a 1–0 replay win over Morton.
More disappointment followed as they were once again left trophyless in 1951–52, however Cox continued to be an important member of both the Rangers and Scotland teams.
Cox played in 44 games out of 47 in season 1953–54, however Rangers failed to win a trophy and finished fourth in the League.
[11] He made his international debut on 23 May 1948 in a 3–0 loss to France as a late replacement for Billy Campbell whose boots had broken; due to the unexpected change, some records incorrectly attributed this to Charlie Cox, a distant relative who also played at a high standard but never appeared at international level.
[12][13] In 1954 Cox played his last match for Scotland; he captained the team at Hampden in a 4–2 defeat by England in front of 134,544 spectators.