1. A surveillance system comprising: an elongated carriage track positioned along a line; a carriage adapted to be supported by and be movably operated along said track; drive means for positioning said carriage along said track; a television camera supported by said carriage and positioned to view regions on the side of said track; light attenuating means including an at least partially opaque cover extending from end to end of said track for blocking light transmission in through one region of said cover and out through another region of said cover whereby the outlines of said camera and said carriage are hidden; display means for displaying the output of said camera; and control means for selectively operating said drive means for selectively positioning said carriage along said track, whereby said camera may be positioned and selectively view a particular side region.