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@Dieseler posted:

The earlier version but have had both and can say just like the earlier version 675/2025 vs the later 2025/675 the earlier is a quieter smoother running engine .

Why is that? It has been said that the machining standards loosened later on, its been my observation those early version 2026, 675 , 2025 vs the later ones its true.

My opinion those early ones were indeed the Zenith years for Lionel spur geared motors.

Bingo @Dieseler, I couldn't agree more that the early 675s,2025s and 2026s were by far the smoothest and quietest running of this genre of engines.  Not sure why but perhaps they used a different motor altogether but loosening up the machining standards certainly could have caused the difference.  The later ones don't run nearly as quiet and smooth as the earlier versions.

@OKHIKER posted:

perhaps they used a different motor altogether but loosening up the machining standards certainly could have caused the difference.  The later ones don't run nearly as quiet and smooth as the earlier versions.

The biggest difference/impact was the move to aluminum parallel plates in 1950. They are just not as heavy, tight, & rigid as the original steel construction.

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