"I kind of had an idea going out that we'd be far enough back", added the jockey, who was out of luck from four rides on his return to action at Kelso on Monday.
The 14-1 victor One For Arthur, thought to be named after the famous Irish brewer Arthur Guinness, held off the challenge of Cause Of Causes to triumph, with Saint Are third and favourite Blaklion fourth.
"It's brilliant for Scotland".
"When Derek got injured we lost a big part of our yard because we're all a team, we really missed him". We have a fantastic team behind us and I'm just so pleased.
Owners Belinda McClung and Deborah Thomson chose to call their syndicate "Two Golf Widows" after they bought the horse while their partners were out playing golf.
Russell was becoming the fourth woman to train the National victor after Jenny Pitman, Venetia Williams and Sue Smith, and went on: "It means everything".
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Scudamore, who never managed to win the National as a jockey but whose father Michael did in 1959 aboard Oxo, said: "It's very satisfying".
Russell wore a wide grin as she received widespread congratulations and declared: "He's done us proud and he's done Scotland proud". "He's such a courageous horse", said the 24-year-old Irish rider.
"For a horse like that and a jockey like that what could be better?"
"It means everything, of course it does", said the 50-year-old, who is based at Kinross, Tayside, north of Edinburgh, and follows Jenny Pitman, Venetia Williams and Sue Smith as National winners.
Blaklion was sent off as the race favourite and under Noel Fehily travelled powerfully, to a point they looked likely to win by cruising into the lead with three fences to go. Scu said "just keep him travelling and once he's in a good rhythm then just keep him going". It's the best feeling I've ever had - I can't describe it. It felt like we were accelerating, which you couldn't believe at the end of a four-mile race. It's been an absolutely incredible day.
She went on to win another Grand National with Royal Athlete in 1995. He jumped fantastically and I thought Derek gave him a great ride. We didn't realise we had just bought such an incredible horse, but he has given us such a wonderful journey.
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