Yes, they will, and Bachmann UK will have an appropriate locomotive.
Have fun!
the Bach-man

Dear Hi,
I believe you are correct; they are OO.
They are great sets! Enjoy them!
the Bach-man

 Dear LIRR,
As far as I know, they are all the same.
Have fun!
the Bach-man

Dear Paul,
Analog locos will run the same direction on the track regardless of which way they're facing.
You'll be fine.
Have fun!
the Bach-man

I got mine today- a beautiful issue!
the Bach-man

Dear Ken,
Very interesting idea!

Dear Davis,
Please contact the service department. They will have the info you need.
Thanks!
Bachmann Trains

Please contact the service department for help.
Thanks!

Dear Karissa,
An oval of 18" EZ Track will be just what you need!
Fourteen feet is relatively long; you may need to run some power feeders from a single power pack.
Have fun!
the Bach-man

Dear Al,
Sadly, Kalmbach has discontinued Garden Railways.
They do have an abbreviated version on trains.com
It's worth a look!
the Bach-man

Dear Sammy,
Go on line and order a copy of Garden Trains Annual.  This will give you many ideas. Also try to find
a club in your neck of the woods.  Members are generally happy to offer tours of their railroads.
In what general area of the country do you live?
You're in for a great time!
Have fun!
the Bach-man

Dear Stephen,
Many years ago Bachmann offered an HO Flying Scotsman. I doubt that the chassis were identical, but I don't know for sure.
Have fun!
the Bach-man

Dear Mike,
Please contact the parts department.
They'll know what and when!
Thanks!
the Bach-man

Dear Bill,
Please contact service for a replacement.
Thanks!

Dear CL,
If you mean swapping shells, I'm sure you can do it, but some mods may be necessary.
If you try it, let us know how it comes out.
Good luck!
the Bach-man