The 100-foot through truss turntable now dismantled at Chama, New Mexico, shown here at its original site, the 7th Street roundhouse of the Colorado & Southern in Denver, Colorado. This photo taken about 1971, after the roundhouse was reduced in size about 1960-61. Turntable and roundhouse also hosted Santa Fe power in Denver, plus both narrow and standard gauge C&S and CB&Q steam until 1942.

http://www.jerryapp.com/arcv3d/ja-r549.jpg