I just purchased a K-Line Hudson steam engine and tender that has TMCC. When I run it in command mode it acts just like it is a conventional train. It will not keep a slow constant speed throughout the track. I have to increase it to a higher speed or it will slow down and struggle to make the curves. The engine speeds up around the curves and slows down on the straight parts of the track. I wanted to ask if someone knows what might be going wrong. I expect that in the command mode I should be able to slow the engine way down, and it should maintain that steady slow speed throughout the layout with no increase or decrease in speed. 

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Not that surprising, many of the K-Line locomotives don't have cruise control, what you describe is exactly how they run.

You'll have to consider adding a cruise module, the ERR Cruise Commander M is what you need.  Very simple installation.

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I linked you directly to the 3rd Rail site, you can purchase it right from them, they are the manufacturer now!

Here's a link to the ordering page direct:  3rd Rail ERR Order Page.

You want this one.

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