Let's have a thread about the best bus: The trolleybus.

Jokes aside, I was recently thinking how come in the 50's-60's so many cities around the world suddenly got trolleybuses, but then they died out again all of a sudden. Why was that? Why were trolleybuses so popular only for such a very short time?

Are trolleybuses still a good transit option? Are battery buses superior? Or is it actually advantageous to have electric buses that don't depend on batteries?

Talk about new trolleybus systems or extensions of existing systems. Which cities still have trolleybuses, and which cities still care for them instead of letting them slowly die out?
Also talk about past systems.


Pic related is the first trolleybus that ran in Shanghai, which has the oldest continually operating trolleybus system in the world. It started operations in 1917, and is now 101 years old, the only trolleybus system in the world that's a century old.