Hi there:  We found a "Bachman Big Hauler Thunderbolt Express" train set, Item #90011, in my mom's garage.  The set appears to be fully contained and with no wear and tear. We'd like to get it up and running.  But it's missing two  critical items: a) a manual and b) a power source.  There are 2 things that appear to be "track power terminal clips" but there's no power source/transformer/connector -thing.  There's also no power wires or anything like that..to connect the track to a power source. 
We're seeking advice on how to get this train up and running..i.e, what parts do we need to order, etc.
More info from the box:
"complete ready-to-run electric train set"
"authentic 4-6-0 steam engine with electronic steam sound, realistic smoke and operating headlight"
"authentic 'g' scale-compatible with all popular brands"
There's a price tag from Toys rUs and I'm guessing it was purchased between 1990-1998.

Thanks for whatever help you can provide.

Liz