Legacy Mallet cab light is blinking ???

There should be a list of codes on the last page of the manual:

Number of Blinks        Diagnostic Code Description

            1                              Main drive motor stalled.

            2                              Smoke 1 element problem.

            3                              Smoke 1 fan problem.

            4                              Not applicable.

            5                               Not applicable.

Since it is stopping, I suspect its flashing 1 blink consecutively indicating a motor driver stall.

Various things can cause it to stall. I'd start with the easy stuff. Are the track and pickup rollers clean?  even if it doesn't "look" dirty it could still be an issue.

Check to make sure the traction tires are not rubbing the brake shoe detail. If so, loosen the brake shoe and rotate it away from the driver and retighten.

GunrunnerJohn should be along shortly with more ideas.

What's the product number of the engine?  If it's blinking out an error code, as Rick says, it's likely the motor stall code.  I've had those for a number of reasons, typically it's excessive friction or binding in the drive train, but I've also seen a loose connection do it.

Rick, John  thanks for chiming in here. I now see it in the manual.   The product number of the engine is 6-11321

My first inclination was dirt and I cleaned the wheels and pick up rollers.

Its strange,  I went to the layout to count the # of blinks and it  was 4.   I shut it down for a minute then restarted it just to double check I counted the blinks correctly. There were no blinks this time and the engine ran perfectly for a few minutes. I also turned off the smoke units ran a lap then turned on the main smoke unit ran a lap then turned on the Aux smoke, and both worked as expected. It ran for a another minute then just decided to come to a slow stop and was unresponsive.

Although it ran smooth I'll check on the brake shoes. Looks like need to remove the boiler and check the wiring and for any loose connections as well as making sure the motor and drive train are ok

any other leads from this update will be helpful

THANKS Steve

A physical inspection seems the right course of action.  When you're in there, rotate the motor through at least one full rev of the drivers in each direction and see if you feel any changes in the force required.  When the wheels suspended, it should rotate pretty much like it's freewheeling.

Took it apart and nothing apparent. The drive train wheels and brake shoes all checked out ok. Just boxed it up for  its trip to Freehold NJ and to Alex Mallae. Will update when Doctor Alex gives it the once over.  to be continued....