Watch out - 1993 - Even though that engine has an electronic e-unit, it may still have an AC motor. I had a Lionel SD-40 from that time period with electronics such as that. You may want to disassemble the engine until you can see the difference. A DC motor also called can motor has basically looks like a can of some dull metal with two wires coming out one side, and a shaft on the other. An AC motor is a more complicated affair, it and has four wires. You would buy the AC product (AC Commander, I would have to go to ERR website) for that. You used to be able to buy something called an LCRU for that. Then if it is a can motor, the above referenced products would apply.
In my not-so-humble opinion and/or personal preference, if it is an AC motor, I would not bother upgrading the engine.
(The so-called AC motors in Lionel trains are actually "universal", they can run off of AC or DC, but everybody calls them AC, and to further complicate matters, TMCC needs AC. DCS can work with DC on the track, but as far as I know, no DCS product was made that could work with universal motors.)
