It had been shut down for a month because several wheels on the tour cars were worn down and no longer safe. The eight wheels have been replaced by all new steel wheels.
The railway, billed as the "Shortest Railroad in the World," was back in business Tuesday afternoon, taking passengers on one-minute rides up and down Bunker Hill.
Railway officials said the repair job cost around $40,000, a price that will not likely be recuperated through Angels Flights' quarter-per-ride fare.
The Angels Flight Railway Foundation relies mostly on donations to stay in operation.
A beloved relic of downtown's past, the 110-year-old railway reopened in March 2010, nine years after a fatal accident halted the rides and forced an extensive overhaul of its operating and safety systems.
The Associated Press contributed to this report.