Thank you! Mine is "Plaxton Leopard on a Volvo chassis, seating fifty-two", because I don't know the names of any coaches, so I had to Google a coach hire company's list of their coaches, and "Plaxton Leopard on a Volvo chassis, seating 49-53" (adjusted to rhyme) leapt out and set the shape of the whole poem. #plagiarism

I don't know what difference a Volvo chassis makes. My best guess it's an improvement on a standard leopard, bringing it up to near cheetah speeds.