A photo of the Missouri-Kansas-Texas roundhouse and turntable in Franklin, Missouri in July of 1923:

http://whmc.umsystem.edu/invent/3853f284.jpg

Scroll down in this picture report on the Katy bike trail, to see a couple of photos of the turntable as it looks today:

http://www.bikekatytrail.com/morephotos ... =14&oid=11

Although the one photo caption says "roundhouse", I assume that the roundhouse is gone and that they simply mean turntable.

Les