Trainer Mark Johnston claimed a record-breaking 4,194th career victory in Britain after Poet's Society won at York.
The Middleham handler has been prolific for many years and his latest success has seen him overtake Richard Hannon senior as Britain's winning-most trainer.
Ridden by Frankie Dettori, Poet's Society was sent off at 20-1 for the Clipper Logistics Handicap and got home by a neck from 5-1 joint-favourite Kynren.
Johnston had been on the brink of the record for a while, and was delighted to finally get over the line.
He said: "It's been very frustrating, but it's not as if we've had loads of odds-on shots beat. Relief is the main thing I'm feeling - it's out the way now and on to the next one (winner).
"If you could have had the perfect result it would have been Joe Fanning on board, but, as we were saying earlier, because it was Frankie no one will forget it."
Born in Glasgow, Johnston, 58, is a qualified vet and having married childhood sweetheart Deirdre in 1985, he took out his trainer's licence in March 1987, saddling his first winner in July that year, when Hinari Video won at Carlisle.
His first Group-race winner came through Marina Park in the Princess Margaret Stakes at Ascot in 1992 and many big-race successes have followed, including three wins in the Ascot Gold Cup courtesy of Double Trigger and dual victor Royal Rebel.
Classic glory has been achieved with Mister Baileys in the 2000 Guineas and the brilliant Attraction in the 1000 Guineas, while he currently numbers 43 Royal Ascot triumphs on his CV.
He added: "I started small. It was just one winner at a time and with horses like this. That was his sixth win of the year. That's what it's about - to run them.
"This horse epitomises what we're all about - I think he's won about nine races now.
"This is a special place to do it, as well, but it's business as usual now.
"We've got friends over - not for this (the record), but because it's York - and it's certainly not going to be a quiet night.
"From where we started, I've got to pinch myself."
Reflecting further on his achievement, Johnston said: "I don't think anyone has belittled the record and sometimes I have to take a breath and think how important it is. Now we can get back to business.
"To do it here is great, a big crowd and I really appreciated the applause. I nearly wasn't here, though. An owner came to see some yearlings we'd bought in France and I had to decide whether to stay and meet him or come and see two runners who were 20-1 and 33-1.
"When I set out (as a trainer) it was all about winning Group Ones and Classics, I had no pretensions to train so many winners, I didn't even know who held the record.
"It only really came to my attention when Richard Hannon took it off Martin Pipe and then I thought 'I can get that'. "It won't be a quiet night, that's for sure."
The racing world paid tribute to Johnston following his achievement.
Martin Pipe, former record-breaking trainer
"It's a marvellous achievement and I'm delighted for him. I read the other day that I was his inspiration, which is nice.
"He's obviously a brilliant trainer. It takes a lot of dedication and preparation and he has a wonderful team behind him.
"It's a wonderful achievement and I admire him very much."
Charlie Appleby, Derby-winning trainer
"He is the ultimate professional and his results and statistics only speak for themselves.
"Everyone has their own ideas what they want to do and he has certainly raised the level in the game, his results prove that. It is something you have to aspire to. He has definitely changed the dynamics of the game.
"Richard Hannon and Martin Pipe did very well, but what Mark Johnston has done is bring it to the big stage as well. As we all know at places like Royal Ascot and Glorious Goodwood you fully respect his horses and his results have shown why.
"He has done it across the board. He has produced Group One and Classic winners. It is not just a flash in the pan, it is year on year and it is relentless. It is full credit to himself and the team."
William Buick, jockey
"This is a huge milestone. He is never afraid to run horses and has proven time and time again that what he is doing brings him success. It is a very well oiled operation with key people behind it and it is a credit to all of them.
"He is very easy to work with. There is himself at the helm, then there is Charlie, who is getting more involved, and Deirdre. He is a joy to ride for. He will keep going and he will not rest on his laurels.
"I've had a couple of nice Royal Ascot winners and I've obviously won the Cheveley Park for him, so they are the nice winners that would spring to mind."
Jim Crowley, jockey
"It is a phenomenal achievement and it is something that is not slowing down and continuing to grow.
"I've ridden out there and it is an amazing place. It is a fantastic achievement and it is very well done to him.
"They've got a very good system and it works. You look at the people who Mark has overtaken - Martin Pipe and Richard Hannon senior. It is a phenomenal amount of winners to train and I'm sure he will train plenty more as well.
"He is very easy to ride for and his horses are renowned for being extremely fit and hard to pass in a race, they are just tough horses."
George Scott, trainer
"It is a phenomenal operation. From a young trainer's point of view his horses are always ones I'm terrified to take on if I fancy a horse, as they just seem to run out of their skin every time they come to the racetrack. I've huge admiration for him and I would imagine we will be competing against each other for years to come. I imagine he will be beating me more often than I beat him!
"What is more impressive about him is the operation he runs. It is just so efficient. He turns his staff out impeccably and they get rewarded with best turned out prizes and those sort of things, so from that point of view it is as impressive as the winners."
Gary Moore, trainer
"I think it is fantastic, really. The man is someone we all look up to. He is not scared of running them and they always look fantastic. They just don't stop running and it was similar to how Martin Pipe was a few years ago.
"Full credit to him, I think the man is pretty much a genius. How can you manage all that (number of horses) and get them to run as consistently as they do. I struggle to manage 100 horses - what it must be like for him I don't know, so full credit and big respect to him."
