Found it! The cover photograph, in color, shows a PCC on the 8th Street Elevated on 15 October 1955. The 8th Street Tunnel and Elevated closed on 29 April 1956, a little over a year prior to abandonment of the entire system on 24 June 1957. Chapter three (pp. 54-62) has an additional 14 photographs, four of which are in color, and pg. 73 has a b&w photograph of work motor 041 exiting the tunnel at the western end.
Reference: Kansas City Streetcars Remembered by Henry Elsner, published by NJ International, 1991, ISBN 0-934088-27-6, Library of Congress 90-064423
If you want a copy and can't find the book through the usual sources let me know - I've got Henry's address, and I suspect he's got a few copies laying around. Or come to the National Trolley Meet in Pennsauken, NJ on 1 May 1999 and meet Henry for yourself - he hasn't missed one yet! (For more information on the Trolley Meet go to the home page of the East Penn Traction Club).
Until next time...
Anon_e_mouse