This is a very interesting topic. I would imagine by pulling the motor out of the original location and insert it into the tender, it would cause the front of the locomotive to be too light? Some king of weight might be needed.
Can you post a photo of the 4-4-0 and please keep us posted!

They already have.  I have a Pennsylvania one. It comes with DCC on board and it's very cool. However, since it is very small, you have to make sure you have a clean track, a number of feeder wires to your track for power, and electrofrog turnouts.

When I purchase a Bachmann locomotive on EBay, I look at 3 things. The box that it's in, the couplers and what the engine looks like underneath. I always put the details last. The box tells me if the engine has been manufactured recently; if it has DCC installed or not. Second, the couplers tell me also that the locomotive has been manufactured recently; does it have the Bachmann couplers or the old school couplers? The underside of the locomotive will tell you if it has a split shell or does it have a plastic piece applied with the words DCC? Does it have a plastic piece with slots for the built in speaker? These are the differences that make up a more modern Bachmann locomotive from one that was manufactured 30 years ago. I have been a big fan of Bachmann for many, many years and even the old engines run good and in some cases easy to repair.

Good Day, I use Bachmann couplers throughout my rolling stock. However, most couplers have plastic wheels installed. Who makes metal wheels that fit Bachmann N Scale couplers? Thanks!

Good Day. I have a question about N Scale EZ mate magnet couplers. I was wondering if other people have experienced what I am trying to describe below.
My cars and engines use EZ Mate Couplers. I seem to have a common occurrence when trying to couple two cars together.
For whatever reason, cars will not couple.  The couple heights are the same and the couplers are new. For example, the couplers come in contact with one another and seem
to clasp, but when the engine pulls away, a car is left stranded and would not couple to another car. I would like to think since we are dealing with magnets that I would not have this problem.
The couplers/trucks on my cars are made up of roller bearing freight trucks, some friction bearing and some have the frame mounted EZ mate couplers. Any insight would be greatly appreciated and thank you for taking the time to read this.