Walk Cool ran his last race in August of 1995 and is now the target for the current day bush icon.
Walk Cool is regarded as the record holder for the modern era of racing in Australia.
The Miles-based Paul Currin – who bred and part-owns the gelding - thinks old Fab will be able to get there.
Having ridden across Queensland since her maiden race day engagement last year, Nielson had come across the popular galloper on a number of occasions.
As well as bringing up the 50th win on Saturday, she also joined another rare club.
Nielson won at her first ride on Cowboy.
Leslight won on his first race ride on him.
Apprentices Minonette Kennedy, Olivia Kendal and Rebecca Wilson also won on their first rides on Cowboy.
As his win total rose over the years, so did the weight he was asked to carry on race day.
He thrives on having claiming apprentices ride him with Nielson’s three-kilogram allowance valuable on Saturday.
“I have crossed paths with him a couple of times and given him a pat when he is in the tie-up stalls,” Nielson said.