@D500 posted:Lionel's "cheap" RS-3 is one of the more under-appreciated basic locos around. Excellent body shell tooling, OK handrails if they are the metal bversion (but oh, those pilots need some love), excellent "Alco" ( AAR) truck side frames - reasonably durable, too, if not PW anvil-tough. The motors are more prototypical in their location than any other platform of which I am aware - traction motors mounted low and transversely at the truck axles. I have owned a couple, and still want to ERR one of them (I have done a Lionel 0-4-0 with ERR, and its motor is similar to the RS-3's).
Unless I am misinformed (say it isn't so!), old Lionel PW transformers start at 6 volts, which makes it hard to run many of the basic can-motored modern locos at anything like low speed. I can run one of these conventionally at less than light speed using my Lionel Powermaster, which does not start at 6 volts. It won't creep, mind you, but it doesn't have to fly, either.
Your D&H behaves very well.
This was re-wired in series which makes a huge difference. I've done the same with all of my K-line locos.
I'm using a KW for power which starts between 6-8v.
I'm about to install a LC/bluetooth board in a Weaver RS3. It's an affordable alternative for command control in low end engines if desired. Universal remote or smartphone control with the LC app for under $100......
Bob