AMCDAVE at the time it was nice to see Lionel make a new engine mold. MIKADO 4501 is correct. It sits on the 746 chassis. Also to note that a majority of them were not good runners due to the wrong bearings put in on the motor shaft. I have both the Rock Island and the DL&W. I did hear that later they issued it in a Great Northern which seemed to have the problems that plagued the first two taken care of. Eventually I'll get to putting in the right bearings so mine will run better...............Paul
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