The phrase "a difficult track" is correct and usable in written English.
It can be used to describe a challenging path, course, or route, often in the context of music, sports, or physical trails.
Example: "The runners struggled to complete the race due to the difficult track that included steep hills and rough terrain."
Alternatives: "a challenging course" or "a tough path."
"I think that Belmont can be a difficult track to come into," Romans said.
Despite being a heavy favorite, Verrazano was making his stakes debut on a difficult track he had never run.
The brakes are not overly stressed on the Spanish circuit, but it is a difficult track for setting up the aerodynamics.
The graves lie beyond the reach of any vehicle up a difficult track across rugged terrain, suggesting that whoever was in the graves was alive when they made the climb.
"It's a difficult track — it's a square and very flat — and it's tough for cars to get around there," Jimmie Johnson, the two-time defending series champion, said recently.
On a difficult track to overtake there were more moves than might have been expected and seeing cars inches from one another, nose to tail and looking for tiny advantages through the corners is a sight to be savoured.
Hughes's decision to retire after Glorious Goodwood, a meeting staged at a notoriously difficult track where he is an acknowledged master, leaves Silvestre de Sousa as the long odds-on favourite to win the Flat jockeys' title for the first time.
Epsom is a notoriously difficult track, as Dettori showed in an uncharacteristically inept display on Blue Bunting when favourite for the Oaks two years ago.
But that gave me so much confidence that I could play at a high level, I could shoot those scores and I could play against the top players in the world on a very difficult track".
"It's a very difficult track on which to get the lap right," Vettel said, "but we got it together and I'm very, very pleased with the result".
It was an inconclusive session held in more difficult track conditions than Friday practice, when lap times were faster.
