A fire broke out Friday at the scenic Durango-Silverton railroad and damaged a historic building and six of eight locomotives at the major tourist attraction.

There was no immediate assessment on the amount of damage to the engines, but city officials worried that the fire could delay the start of operations this summer.The narrow gauge railroad is a leading tourist attraction in southwestern Colorado, carrying between 175,000 and 200,000 passengers each year on its 40-mile track through the San Juan National Forest.

The fire was discovered around 3 a.m. by one of the railroad's security guards, Durango city manager Bob Ledger said. It took firefighters from Durango and the Animas Fire Protection District about 21/2 hours to control the fire.

The historic roundhouse was built in 1881, the same year the city was founded. In addition to the locomotives, the building housed antique lamps and other spare parts.