Thank you ABC and Jim for your speedy and informative replies!  What a wonderful, supportive group.  I will talk over our options with my husband (a machinist) and decide how we want to approach it.  He will definitely be a happy boy this Christmas with some sort of expansion to his set.  It amazes me how focused and dedicated he is to his train hobby for a young boy.  Training must be in his blood!

Thanks Again!

A Thankful Mom

oops forgot to mention it is HO

New user (mom of new 'engineer').  We purchased a Toy Store Powerlock track for my son last Christmas...He has since become obsessed. lol
We would like to add to his set for Christmas and have heard Bachmann is the way to go. 
Questions: Is Bachmann compatible with the Powerlock track for (I think it's called a turn out?) basically connecting the (new) Bachmann to his current track?   He is also intent on having a working crossing (lights, stop bar etc.).

Any suggestions, ideas, pointers?