What fictional kingdom did Trolley visit on Mister Rogers' Neighborhood?

Trolley visited the fictional kingdom called the Neighborhood of Make-Believe on Mister Rogers' Neighborhood.

The puppet characters lived in this imaginative land, ruled by King Friday XIII and Queen Sara Saturday. Other familiar residents included Daniel Striped Tiger, X the Owl, Henrietta Pussycat, Lady Elaine Fairchilde, and Grandpere.

Trolley was the small red electric vehicle that carried viewers from Mister Rogers' house into the Neighborhood of Make-Believe. Its whistle and bell formed part of the show's distinctive transition into the puppet story. The kingdom was imaginary, but its stories often addressed real subjects such as friendship, responsibility, fear, and disagreement.

A common mix-up is to call the setting simply “Make-Believe.” The show's canonical name is Neighborhood of Make-Believe. The characters and many of its central ideas originated in earlier Fred Rogers programs, including The Children's Corner and the Canadian series Misterogers.