Northcott (42) travelled south from the Waikato for her ride in the amateur riders' race on yesterday's seven-race card at Wingatui.
Part of the reason for her trip was the chance to ride her own horse, Mr Nobody, in the rating 65 1600m.
Northcott achieved one half of her double when she steered the Jack and Jo-Ann Gordon-trained gelding home to a 5 length win before jumping on a flight to Hamilton via Wellington.
The second half of her interisland day took place at Cambridge last night when Northcott jumped in the sulky behind Easy For Cullen in the amateur drivers' race at 9.10pm.
Northcott said the dual-code day was not a long-term plan but once she realised it was possible, she decided to give it a go.
''There was a race at Cambridge [programmed] and you always keep an eye out for the races up there,'' Northcott said.
''Then Jo [Gordon] said we might stick him in an amateur race down here. So I had a look and thought I can do that as long as the flight out of here isn't too late and as long as Cambridge has the race late up there, it's fine.''
Northcott caught the 4.25pm flight to Wellington before transferring to the 6.30pm flight to Hamilton, arriving in Hamilton by 7.40pm.
''As long as the plane's not late, I'll be there.''
Northcott did make it and put in a big run three-wide on Easy For Cullen in the last lap but fell just short, beaten into second by Live Life Betta. Mr Nobody's victory almost achieved a personal goal of Northcott's.''
I wanted to own, train and ride one [to a win] - this is pretty awesome too because I bred him as well. All I haven't done [yesterday] is train him.''
Northcott has six amateur riding wins to her name, along with 13 amateur driving wins, in the past three seasons.
One of her highlights in the harness code came when she drove a winner at a invited drivers' series for female amateurs in the southern Italian city of Taranto in 2012.''
It's a whole different ball game over there - different driving styles, different rules.
''And you're so much closer up behind the horse - you can touch them when you're sitting in the sulky.''
