The phrase "an endless procession of" is correct and usable in written English.
It can be used to describe a continuous or unbroken series of events, people, or things that seem to go on indefinitely.
Example: "As the parade began, there was an endless procession of colorful floats and enthusiastic marchers filling the streets."
Alternatives: "a never-ending stream of" or "a continuous line of".
Across the TV screen marches an endless procession of peddlers.
"It's like an endless procession of Busby Berkeley girls, disguised as notes," Umanov said.
Aim for an endless procession of lettuce leaf pickings, rather than a glut.
For example, there are astonishing formulas in which an endless procession of smaller and smaller numbers adds up to pi.
"And," he adds, gearing up for the zinger, each "had to facilitate an endless procession of facile observations and labored one-liners".
There are no playoff games — or, rather, there is an endless procession of dubious playoff games, each one promoted as if it were the Super Bowl.
For 53 years, the Balderrama family has presided over a seemingly endless procession of acts in a triangular hall decorated with animal skins as well as photos and caricatures of the great names of zamba, the heartfelt local music inspired by country life.
Though Labour joined the Lib Dems in proposing a switch to the alternative vote, a seemingly endless procession of Labour dinosaurs made the conservative case for retaining the current system.
His new life would become a seemingly endless procession of painful surgeries and dreary rehab sessions, a struggle to master the wheelchair and, eventually, prosthetic legs and a mechanical arm.
That's because the workers in question were technically employed by a labor supply firm, Integrity, which staffs Amazon warehouses with a seemingly endless procession of temps.
As trainers and coaches formed a nearly endless procession of sympathy, Wilson sat on the floor, his head down, sobbing.
