Teenage apprentice Patrick Moloney registered a landmark win, at the same time adding to a rich family tradition with victory on Post D'France at Sandown on Wednesday.

The win came at Moloney's first city ride and followed a season in which he has landed 37 winners on country tracks.

But of greater significance for the 19-year-old is the history that preceded his breakthrough success.

Moloney is the grandson of Jim Moloney, the trainer of the champion sprinter Vain who was one of a string of star gallopers he prepared, including Caulfield Cup winner Affinity, the Classic winners Rom's Stiletto and Raveneaux and prolific country cups specialist Warri Symbol.

His great grandfather Jeremiah Moloney began training almost a century ago and his father Gerard is a successful Melbourne trainer as is his uncle John.

But Patrick is the first member of his family to be a jockey.

"It's obviously great to have the history behind me and the help my Mum and Dad and everyone at home has given me," Moloney said.

Moloney's winning ride drew praise from trainer Stephen Brown who had kept him on Post D'France after he won on the former New Zealander at its only two previous Australian starts.

"That was a fantastic ride," Brown said.

"It was Patrick who convinced me to bring the horse to town and he asked if he could follow him through.

"He didn't make a wrong move at any stage."

Moloney said he and his father had deliberately delayed his appearance in Melbourne until he was ready and had a horse good enough to win on.

"It was always the plan to hold off in town to make sure I came when I was ready and on the right horse," Moloney said.

"It's fantastic, everything went right and the horse was good enough to put it away."

Moloney had Post D'France ($7)in a comfortable spot behind the leaders until the 300m, producing the horse at the right time to score by a head from Police Gazette ($3.70) with the favourite Oneman Wolfpack ($3.50) a length further back in third.