Hmmm. As the OP, I was indeed referring to its construction - not how it was operated. That said....on my #50 the windings were indeed applied separately/sequentially during manufacture. One complete winding is next to the center of the bobbin (the "inner winding") and the second complete winding was made on top of the first winding about 1 cm farther away from the center (the "outer winding"). Winding both simultaneously (i.e., so that each individual turn was laterally next to its twin) would have made more sense (or, to CW's comment, using a bonded double-strand of magnet wire) but that's not how it was done, at least in this case.
Over the past 50 years, I have serviced a large number of 50 gang cars (all variations), #69 maintenance cars, and many other Lionel double wound motors. I cannot recall seeing one wound as you describe. Maybe yours had been rewound before you got it.
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