K-line O gauge K-Line Shay that had the motor driver board shorted out. Replaced the board but then had no chuff. Suspected that when the driver board shorted out it also took out the speed sensor board so I by-passed it and installed a mechanical chuff switch. Need advice or help repairing or installing new features on your rolling stock? Please email me at email@example.com or call me at (847) 727-0857.