I don't believe there were three different roundhouses, I believe there were three different enginehouses and two of those were roundhouses. There was the rectangular enginehouse uptown across from the run-thru depot, there was this wooden roundhouse at Hillside Drive, the first one at McDoel, and when this burned in 1908, they built the brick roundhouse that lasted until the end.
They had a rash of fires around that time. In 1907 the old two story dispatcher's office and a restaurant, both on the west side of the yards at Hillside Drive, burned, then about a year later this roundhouse on the east side of the yards at Hillside burned. / Ron