On Sat, 17 Sep 2011 08:31:22 -0700, 77002 wrote:

Often wondered if there is an application for a streetcar/tram or
electric/trolly bus that runs under wires where practical, but utilizes
batteries for stretches where wires are not practical, or unsightly.

I think that's been done..

Actually, weren't the BR(S) Motor Luggage Vans an application of this
principle? 3rd rail for most jobs, batteries for light work off the juice?

--
Speaking for myself, and no-one but myself