As has been stated the 1950 and also the 1964 to 1966 773 Hudsons were geared at an 18:1 ratio enabling them to run at what was considered to be a more prototypical speed as compared to almost all other Lionel steamers of those eras. I have both the 1950 and 1966 versions of the 773, both of which are fully serviced, and while the 1950 version runs a tad faster than the 1966 version the difference is infinitesimal. I think your 773 runs just about right but it still wouldn't hurt to re-check its servicing. Good luck with your great engine.
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