Reply to "Restoring a Lionel PRR Prewar Steam Switcher & All Things Related to Keeping Them Running! Spring 2024"

Ted SOGR Forum Member DIGITAL SUBSCRIBER

Wow, always wanted to know about the gearing. I wonder if all of these switchers had 3-lead worms.

[A little OT, but the 700E started out at 12:1 with a triple-threaded worm, and after the first year or so, was sold with a two-lead worm for an 18:1 ratio which survived to modern times (the big bronze worm wheel on the Hudson has 36 teeth.) I also found out last year that even Hudsons with the two-lead worm are back-drivable, once they have been properly broken in.]

The reason I ask, is that the catalog copy circa 1939 mentions a "20:1 ratio." I always doubted that, but if Lionel used 10:19 spur gears with a two-lead worm and a 21 tooth worm wheel, that would be very close. Great info, this thread continues to amaze!!

2/14/174:03 PM

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