Hello--
I've just replaced the smoke unit (pellet type) in my 682 that has been sitting for 30 years. When I put everything back together & I dropped in a pellet, I noticed only the faintest whisps of smoke after a minute or two. The pellet dissolved completely, and then I broke up a second pellet into pieces and tried again...same result. I'm not expecting billowing clouds of smoke to set off the fire alarm in my house, but the new smoke unit produces practically no smoke. It must be working, because the pills dissolve. When I put it in neutral and cranked up the voltage, the caboose was producing thick smoke (I hadn't even put drops in it today) but the locomotive wasn't. Do these @45-year-old pills not work well? Any suggestions?