A former Nickel Plate Road roundhouse in Indiana was damaged by fire on Sunday.
Firefighters in Frankfort, Indiana, were called about 10 a.m. to the roundhouse, which is on property owned by Norfolk Southern and was reportedly unused.
Fire Chief John Kirby said firefighters initially had the blaze under control before a second fire broke out.
The department had to bring in 15 off-duty firefighters to battle the blaze as well as protect the rest of the city.
The fire was finally brought under control after six hours. One firefighter was treated at a local hospital for dehydration.
Fire Investigator Jeremy Ward said the cause of the fire remains under investigation.
“Firefighters were able to get the fire under control quickly and were hitting hot spots when a second fire erupted in another area of the Roundhouse,” Kirby said. “The second fire rapidly got out of control and took several hours to knock down.”