Why can't I ride the tram?

Because the squirrel is taking a long lunch.

It's too bad that he doesn't have anything to eat.

But perhaps you should try finding something for him.

Look for three things that squirrels like to eat.

Try nuts.

There's a pine cone in the petrified forest.

And a walnut in the tree near the guard on the bridge.

And an acorn near the statue in the grassy meadow, on a tree.

Give all three of those to the squirrel, and he'll leave you alone to fix
the tram yourself.

The squirrel worked the tram by making that giant wheel roll.

You have something in your possession to make it roll.