It turns out Sir Rod Stewart plays with trains. Do ya still think he’s sexy?

The 74-year-old rock star revealed that between selling out arenas, he’s been working on a massive model railway for the past quarter-century. He unveiled his hot new “track” during an interview with Railway Modeller Magazine.

“A lot of people laugh at it being a silly hobby, but it’s a wonderful hobby,” said Stewart, whose love of railways began in his childhood when he lived near a London coal yard.

However, this is not your childhood train set. The elaborate 1,500-square-foot layout — dubbed “Grand Street and Three Rivers City” — takes up the entire attic of Stewart’s lavish LA mansion, reports Yahoo News. Inspired by both New York and Chicago circa 1945, the mini-metropolis took the Grammy winner a staggering 26 years to complete.

To put it into perspective, Stewart has toured 19 times and produced 13 records during the time it took to complete his passion project, reports BBC. The piece was so time-consuming, in fact, that Stewart would reserve an extra hotel room while touring so he could work on it. “I was lucky to have the room,” says Stewart. “If I’d have realized at the start it would have taken so long, I’d have probably said, ‘No! No! Nah!'”

Fortunately, he saw it through, saying, “When I take on something creative like this, I have to give it 110%.”

Stewart’s thoroughness is reflected in the model’s meticulous design. The sprawling diorama depicts a city teeming with retro taxi cabs, postwar skyscrapers, decrepit warehouses and other “things that are very run down,” per Stewart’s description.

“Attention to detail, extreme detail, is paramount,” says Stewart, who surprisingly adds that he just “winged it.”

In fact, BBC host Jeremy Vine didn’t even believe Stewart had erected the miniature railway himself. But Stewart insisted that “90% of it I built myself” and that he only had help with the electrical elements.

Nonetheless, his pet project has made quite a splash on social media. “Very impressive, Sir Rod. Nice to see the geeky side of a celeb,” tweeted one fan.

His surprise hobby was also lauded by fellow locomotive aficionado and rocker Jools Holland, who told BBC host Vine, “When you get these big-scale ones like Sir Rod’s, they are like a work of art.

“They’re like an amazing painting that’s been created in three dimensions.”