This looks like a way to cash in what would otherwise be a garage sale. Not all of the engine options have matching cars, no cabooses, it just looks like random stuff that isn't selling.
I ran a couple options, all of which are nearly $500 to your door (without the step 5 accessories), for what is basically some O27 engines and freight cars (or passenger cars). And people will do the same thing I did, get to the cart and close the window.
More attractive diesel/freight car sets are $200 cheaper on the street.
Start these with a 2 and they might be a hit. For 5, someone should let them know April fools is 6 months away.