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What type of gear box does the R/C Molly have?

Except Hiro and Victor (which use two different modified Flat types*), all the early RC engines with battery holders use a similar DU to the "Thomas type". The dimensions are closer to the one from the (later, non RC) Forward/Reverse Thomas, but it has an IR receiver, gearless two way switch and a circuit board among other differences. It explains why the cabs and fireboxes on James and Molly are oversized. The drive gear is identical to normal engines with the "Thomas type" (at least for the HiT Toys version). You once opened a Fisher Price James like these and showed it three years ago:



* For an unknown reason, the one used for Hiro has no switch (in tender instead) while the one in Victor does. Hiro may have been derived from his Talking Flip Face variant.