Dave,
Thank you. I tried to pull the whistle out of its hole to make it easier to add smoke fluid, but I can't get the whistle out, and I'm afraid to pull too hard so I don't break anything. Luckily, I was able to angle the funnel enough so that the fluid would go down the funnel and into the hole without spilling anything on the boiler.
Also, do you know what the two small screws and rubber pieces that Lionel included in the packaging are for?
Thanks again.