<a href="//commons.wikimedia.org/wiki/Camera_dolly" title="Camera dolly">Camera dolly</a> track from J.L. Fisher. There is a piece of 45° curved track, 90° curved track, and straight track in 4, 8, and 10 foot lengths (folded at the bottom).
<a href="//commons.wikimedia.org/wiki/User:Fadookie" title="User:Fadookie">Eliot Lash</a>
CC BY 2.5
<span class="int-own-work" lang="en">Own work</span>