Question: What was the name of the Australian bred Thoroughbred racehorse who won Australia's most prestigious annual Thoroughbred horse race in 1950?

Context articles: Sunline
Melbourne Cup
Ajax II
Comic Court
Kingston Town
Shocking (horse)
Invasor (horse)
Russia (horse)
The Barb
Encosta De Lago

Sunline (1995–2009) was a New Zealand bred Thoroughbred racehorse who was the world's highest earning racemare of her time, competing on 48 occasions for 32 wins, 9 seconds and 3 thirds to earn A$11,351,607.
 She won races in three different countries, Australia, New Zealand and Hong Kong.
 She won successive W.S. Cox Plates (2,040m), the richest Weight for Age (WFA) race in Australia.
 She also twice won the toughest mile race in Australia, the Doncaster Handicap, once as a three-year-old and then again as a six-year-old.
 She was named New Zealand Horse of the Year four times and is also the only horse ever to win the Australian Horse of the Year championship three times.
 The only horse besides Sunline to win as many major races in both Australia and New Zealand was Gloaming, who raced around 1915.
The Melbourne Cup is Australia's most prestigious annual Thoroughbred horse race.
 It is a 3,200 metre race for three-year-olds and over, conducted by the Victoria Racing Club on the Flemington Racecourse in Melbourne, Victoria as part of the Melbourne Spring Racing Carnival.
 It is the richest "two-mile" handicap in the world, and one of the richest turf races.
 The event starts at 3pm on the first Tuesday in November and is known locally as "the race that stops a nation".
Ajax was a champion Australian bred Thoroughbred racehorse and sire, who won 18 consecutive races before he was defeated at the odds of 40/1 on, causing a huge racing sensation.
 He had wins from 5 furlongs (1,000 metres) to 1½ miles (2,400 metres), equalled the Australasian record for a mile (1,600 metres), and created three new race records.
 At stud in Australia, Ajax proved to be a good sire.
 He was then sold as a 14-year-old horse and exported to the United States before he was later sold to Bing Crosby and Lin Howard.
 Ajax was inducted into the Australian Racing Hall of Fame in 2004.
Comic Court (1945–1973) was a most versatile post-war Australian bred Thoroughbred racehorse who set race records at distances of 6 furlongs (1,200 metres) and 2 miles (3,200 metres).
 He won the 1950 Melbourne Cup carrying 9 st and set an Australasian record of 3 minutes 19½ seconds.
Kingston Town (31 August 1976 – March 1991) was an outstanding Australian bred Thoroughbred racehorse who won a record three Cox Plates and 11 other Group One races in a career spanning from 1979 to 1982.
 In 1980 he was awarded the honour of being the Australian Champion Racehorse of the Year.
Shocking is an Australian bred Thoroughbred racehorse, trained by Mark Kavanagh, who won the 149th Melbourne Cup on 3 November 2009 by three-quarters of a length.
Invasor (foaled August 3, 2002) is a Thoroughbred racehorse bred in Argentina by Haras Clausan (Haras Santa Ines).
 The winner of the 2005 Triple Crown in Uruguay, he was later purchased by Sheik Hamdan bin Rashid Al Maktoum, who paid approximately US$1.4 million for the horse.
 His two biggest wins were the 2006 Breeders' Cup Classic, in which he defeated heavily favored Bernardini and highly fancied Lava Man, and the 2007 Dubai World Cup, the world's richest horse race.
 He finished racing with a record of eleven wins in twelve starts and career earnings of $7,804,070.
 He was voted the Eclipse Award for American Horse of the Year and led the year-end World Thoroughbred Racehorse Rankings in 2006.
 In 2013 he was inducted into the National Museum of Racing and Hall of Fame in Saratoga Springs, New York.
Russia was a hardy Australian bred Thoroughbred racehorse who won the 1946 Melbourne Cup and other staying races.
The Barb (1863–1888) was an Australian bred Thoroughbred racehorse, famed for winning the 1866 Melbourne Cup, the Sydney Cup twice, and other quality races.
 He was bred by George Lee and foaled in 1863 at Leeholme, near Bathurst, New South Wales.
Encosta De Lago (foaled in 1993) is an Australian bred Thoroughbred racehorse that won three group races from eight starts including the Group One (G1), Vic Health Cup against older horses.
 He was the Leading sire in Australia during 2008 and 2009.