LOS ANGELES – After more than three-quarters of a century working for public transit agencies, a bus maintenance worker retired Tuesday on his 100th birthday.

For decades, Arthur Winston reported to work at a bus yard at the crack of dawn. By 6 a.m. he would be supervising a crew of workers as they cleaned and refueled the region’s bus fleet.

But on Monday, Mr. Winston abandoned his routine and put on a suit, tie, and black fedora and headed downtown to meet the Los Angeles County Board of Supervisors. There, he was lauded for his nearly perfect work record and decades of service with what is currently called the Metropolitan Transportation Authority.

“I’m kind of nervous about leaving the job, I’ve been doing it for so long,” Mr. Winston told the Associated Press. “I’m going to miss my crew. But I’ll find plenty of things to do with my free time.”

Mr. Winston has missed only one day of work in his entire career, transit officials say. That was in 1988, when his wife of 65 years died.

“He has an impeccable safety record, he never calls in sick, he’s always on time, he’s Mr. Reliable,” said Alex DiNuzzo, Mr. Winston’s manager of seven years.

A co-worker, Sergio Rubalcava, said Mr. Winston began each work day by bending over to touch his toes to demonstrate that he was fit to work.

“He’s incredible,” Mr. Rubalcava said.

Mr. Winston said he was born in Oklahoma and began picking cotton when he was 10. When droughts and storms ruined several crop seasons, his family headed west and in 1924 he found work with the Pacific Electric Railway Co. He left the company in 1928, and returned six years later. Local transit has operated under various names since then.

Mr. Winston credited his father for teaching him a strong work ethic.

“My dad got us out of bed whether it was raining or snowing. We got up at 6 o’clock, no matter what,” he said.