Owner's manual

What are you using for powering the layout?

Does this happen with any other engines or just this one ?

I think the product number if off. I mean I could be wrong, but again with TMCC is http://www.legacykline.com/ord...;p_oem_sku=K-25702TC

The entire list here http://www.legacykline.com/ord...type=O+Scale+Diesels

No manual, but some details in this topic regarding wiring- which is probably more likely the answer than finding the manual anyway.

https://ogrforum.com/...otor-aba-set-k-25301

Edit, here is a topic with "generic" K-line manual- hence why I said what I said, the manual is not the answer to your problem most likely.

Thanks to @Bruce Brown

https://ogrforum.com/topic/k-line-f3-f7-tmcc-a-b-a-set-instructions?reply=158251952039307718#158251952039307718

To PH1975      We have 2 TIU's  and 8 Lionel 180 bricks.

To Richie C    Yes it's  they are the only ones to slow down.

They are older TMCC engines but the came with smoke and cruise control

@hobojoe posted:

We have K-Line #K-25701, with TMCC and Railsounds. The problem we are having that after about 20-25 minutes of running the engines start slowing down.  I'm trying to find out why this is happening, thats why the I need the owners manual.

Thanks for any help on this.

The owner's manual will most likely not help. Answering some questions might help, though if you don't mind.

Have you checked the motors to see if they are hot?

If this is one of the 6 motor A-B-A sets, the motor control boards could be getting hot.

How many cars are you pulling and what brand/age?

How fast are you going?

Up grades and around tight curves?

As Vern stated, the manual will not help you.

I have many of these turn-of-the-century TMCC K-Line sets but never experienced the slow-down problem. Then again, I don't ever recall running them for 25 straight minutes.

Assuming the engine speed is restored after shutting them down for a period of time, it would most likely mean that a part is overheating.

I would unscrew the shell from the lead engine (with the electronic e-unit) so it can be quickly lifted. I would run the engines to recreate the problem and then immediately lift the shell and feel around for any obvious hot components. I then would use cooling spray directed at various components, and then immediately run the engines again to see if the cooling solved the problem.

Cooling spray helps to pinpoint any faulty components.