Can anyone tell me if the headlight on the heavy Mountain is a bulb or LED? Does anyone know the voltage coming out of the decoder? And finally is there a resistor for the headlight on the decoder or before the headlight? Obviously you can guess that the headlight isn't working, not sure what has happened. Before I started tearing things apart I was hoping to get these answers so I can be prepared to fix it right away. Thanks.
https://www.bachmanntrains.com/home-usa/dwg/dwgs/82511.pdf
It's an LED