🚎

a bus that can climb steep hills, go underground (because it has no exhaust pipe), and has very little noise.

but you have to follow the route, or else...

trolleybus is just a filler emote for the TrollFace mostly used on discord.

As the trollface isn't widely available as a global emote in discord, the trolleybus, "🚎" is used as a perfect subsitute.