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Reply to "Restoring a Lionel PRR Prewar Steam Switcher & All Things Related to Keeping Them Running! Winter 2023"

Ted, as far as I know, Lionel never used worms on locos with less than three leads because of the lock up issue you pointed out on single and double lead worms. There was not enough of this loco for me to be able to date it.  So I have no way to know how old it was. It would be a lot easier to adjust the ratio by changing the design of the two spur gears rather than redesigning the worm gear.  

On the 700E there were actually three unique drive train designs.   Took me a while to figure this out. The first 700Es had a 1/8" thick flex coupling element. This must have proved to be inadequate as they changed to a 1/4" thick flex coupling element. To accommodate the thicker coupling element they shortened the worm gear shaft. As you pointed out the, third design was a change to the worm and worm wheel design to change the gear ratio. This third design also has the shorter worm shaft. 

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