Reply to "Lionel Big Boy Lionchief weak smoke?"

I have started to routinely add 30 to 40 drops of smoke fluid to my engines in order to get decent smoke production.  When I have a shell off of an engine, and can watch how the wick is absorbing the fluid, I have already added up to 80 drops and the wick was still absorbing the fluid.  And boy, do they smoke great!  That is how I know that I'm safe with the 40 drops.  I've never run into a problem and the smoke units have never been overfilled.  I refill the smoke units when smoke output is less than half of "normal".  Engines with smaller than normal smoke units would, of course, require less fluid.