hello, need help. My F/C northern stopped smoking and running. The loco will work and run when the smoke switch is switched to NO smoke. It will run in Conv and remote all sounds work when the smoke switch is set NO smoke. But, when it is switched to smoke the loco is dead only the head light is on. So is the smoke unit bad? If so how or why does it keep the engine from running? If you have had this problem let me know. I'll call Lionel to see what I need to do to get a new smoke unit. Thank you, Jake