Maybe.
A wall wart is also a transformer, just a small one.
Some transformers are larger in size but may or may not have a greater output.
The output is actually on the wall wart if you read it closely.
They may contain a variety of terms (ac,dc, amp, watt, volt amp(va), etc) but as a group let you know "how powerful" it is, and ac or dc output.
Bottom line is, "people seldom complain about too large a power supply". The only down side of extra watts/amps is there might be enough juice to jump track a little easier. The solution is less throttle.
....except if it doesn't fit well on the control table then they complain, lol
So if you buy, buy with overkill for at least mild expansion in mind.
(I lined my ceiling shelf with lionel street lights for a very cool "nightlight effect". Those extra lamps use more transformer power (amps/watts.)
Find out what transformer model the store is pushin and list it here.
Part numbers are everything when it comes to help being fast and accurate.
You are just haveing connection problems. A little time and experience looking and the connections and this will pan out for you. A tab bent here, a line squeezed there and you will likely be fine. Some folks get luckier than others is all.
On the bus shorting out(light). You may have to reverse the wires on one of the feeds.
Your greatest tool right now is moving track around for achiving a proccess of elimination. In the end, you may have a piece or two of bad track too.
As you test, the loop need not be complete either.
You can run point to point, backwards and forwards to get "there and back" like real shortline RR might.
At 10x11 squared, Id think about going 80 watt AT LEAST with a bus line too. (a CW80? likely what the store is trying to sell) The more "drops" (extra feeds) from the bus to the track the better.
Many folk ad a drop every 3-4 track sections on permenant layouts (which on a shelf, is you) (you can tap into any track with the right effort). The more drops the less bad track connections matter.
A ten dollar meter for ohm, volts(ac&dc),and amps is a tool that you cant grow your knowledge with.
Don't be afraid to ask about ANYTHING....like fyi, " LHS" meant Dan is at a Local Hobby Shop.
(Sorry, but " energy box" gave your novice statús away more than anything. lol)
Heck, even a super cheapie beats nothing ($1-5 analog meter)