A riddle about buses and trains running “on time” is:
 
Q: Do buses and trains run on time?
A: Buses run on wheels and trains run on the tracks.
 
The joke was posted on Twitter on September 18, 2009.
 
   
Twitter
Bollywood Sargam
@bollywoodsargam
Bus jokes - 2330 Joke: Do buses and trains run on time? Usually, yes. No, they don’t. Buses run on wheels.. http://bit.ly/35EmQ9
9:38 AM - 18 Sep 2009
     
Twitter
Morten Stenbaek
@3dtwix
Do buses and trains run on time? Usually, yes. No, they don´t. Buses run on wheels and trains run on the tracks.
6:30 AM - 2 Jan 2010
     
Twitter
Nitin Goyal
@nitingoyal83
Do buses and trains run on time?
Usually, yes. No, they don’t. Buses run on #wheels and trains run on the tracks.#humor
6:17 AM - 25 Jan 2010
 
Google Books
Sensible Nonsense.. Frank’s Comic Pack:
Humour Pack Series
By Frank Paul
BookBaby
2014
Pg. ?:
“Do buses and trains run on time? Usually, yes. No, they don’t. Buses run on wheels and trains run on the tracks.”
   
Twitter
Zuhed
@Zuhed007
Do buses and trains run on time?
Usually, yes.
No, they don’t. Buses run on wheels and trains run on the
tracks.
2:44 PM - 11 Jan 2018
‏ 
Twitter
lorraine Jo King
@LahLahBean
#badjokethursday
Do buses and trains run on time?
Buses run on wheels and trains run on the tracks.
12:30 PM - 31 May 2018