The length of the race was extended in 1937 .
The event suffered interruption in this period , being absent between 1940 and 1946 due to World War II and undergoing cancellations in 1950 and 1955 .
The length of the race was extended in 1937 , but the event suffered interruption in this period , being absent between 1940 and 1946 due to World War II and undergoing cancellations in 1950 and 1955 .