You gotta go S-L-O-W if you hope to operate in a prototypical fashion. That is NOT something you can normally coax out of a Gilbert 300AC. Rightly so. The 4-4-2 Atlantic was an early passenger thoroughbred based on a prototype that flew the rails, pulling named consists on tight schedules and the AF model is true to the prototype.
So what did I do to achieve a low-end speed of under 11 scale MPH out of mine? Two things actually. 80% of my results come from a Port Lines "Scale Speed" Can Motor Conversion. It's an easy to install upgrade to performance for only $39 (DC operation). The other 20% comes from using a DC 'pulse' throttle - which in my case simply means a 50¢ schottky diode between one terminal of my Lionel Type "R" and my track.
With these two bits of hardware (and some clean track) it takes the Atlantic 17 seconds to crawl over fifty inches!
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