Please help ID this children's song

There was a record I used to love to play as a small child, about a railroad locomotive who befriends a tugboat (named Tuggley?). For fun, they decide to change places one day. All I can remember is that it was sung by a male/female duo, and a few lines as well as the melody:

“Let’s see how he floats!”
“But being a train, he went down down down down down”
“Instead of being an engine, he wished he were a fish”

Google is not helping. Can anyone else?

I’m going to guess that the song is Trains from the 1962 album Dance, Sing & Listen by Miss Nelson and Bruce (Haack), on Dimension 5 Records. The song also appeared on subsequent releases by the label.

ETA: I can’t find the song online atm, or the lyrics. I’ll keep looking tho.

When were you a kid? It helps to know what years can be eliminated from the search.

Tuggly, The Train Who Couldn’t Swim

You totally fucking rock, Elmer! There’s no way that isn’t it!

That’s it! Thanks, to both of you!