Westgarth was a successful football coach after a playing career achieved little of note. He was South Shields' assistant trainer before he joined Ebbw Vale,
Workington and
Luton Town in a training capacity. In 1938 he joined
Stockport County as trainer-manager. In December 1936 he moved to
Carlisle United not waiting to see his Stockport side win the
Division Three (North) title that season. In March 1938 he resigned at Carlisle to move to
Bradford City. He helped Bradford to lift its first honour for ten years, albeit in only the
Third Division North Challenge Cup, in
1938-39. The following season,
World War Two interrupted English football. Westgarth stayed at City until 1943 when he joined
Hartlepools United. He had a successful spell at Hartlepools during the mid-1950s. In 1955 the club reached the 4th round of the
FA Cup, its best ever performance. In
1956-57 Hartlepools narrowly missed out on winning Division Three (North). But in 1957 he was taken seriously ill and died on 4 February shortly after he saw his side lose 4–3 to
Manchester United in the FA Cup third round in front of a record 17,264 crowd at
Victoria Park. ==Honours==