During his tenure with Darley, Peter Snowden has seen many good horses come and go, but there has been one constant - Pinwheel.

The eight-year-old begins what will be his last campaign for Snowden in Saturday's Group Two Expressway Stakes at Randwick.

After John Hawkes resigned in 2007, Snowden was appointed head trainer for the Woodlands racing operation and retained the position when Bob Ingham unexpectedly sold the business to Sheikh Mohammed.

Snowden, who will leave Darley after the Sydney carnival to set up a new training venture with his son Paul, has overseen the careers of many Group One winners including Sepoy and Helmet, setting them up for their dual hemisphere stud careers.

As a gelding, Pinwheel has not had the high profile of some of his stablemates but has won his share of stakes races and more than $1 million prizemoney.

"He is definitely my favourite," Snowden said.

"He is the last of the Woodlands horses I've got and he has been with me the whole way.

"He has come through his barrier trials well and I'm looking forward to getting him back to the races.

"I want to see him win before I leave."

A year ago Pinwheel sustained a suspensory injury when he ran last in the Group One Orr Stakes.

He recovered and was given a three-run spring campaign in Melbourne where he finished just behind the placegetters in three stakes races.

Pinwheel has finished third in two trials to get ready for Saturday's Expressway, the most recent with new race jockey Christian Reith aboard.

He is on the fourth line of betting in early markets behind Boban, 2012 winner Rain Affair and Melbourne visitor Speediness.

Pinwheel's 12 wins include nine over the 1200 metres of the Expressway and he has an enviable first-up record of three wins and a second from six attempts.

His record also includes two wins in the Group Two Warwick Stakes (1400m) and a third in the 2011 Group One Goodwood, Adelaide's premier sprint.