This is the
photo of the collapse I remember from those days. It's on
the same page as the one in Ken's item at the top of this thread.
Its caption is "Now in a very embarrassing position, SN 650 sits amid the rubble of
what once was the Lisbon trestle. The fall seriously damaged the loco's
traction motors, and she was rebuilt to run on only 600 volts.
Photo by Robert A. Burrowes."