“How do trains drink?”/“They chug.”

A train riddle is:
 
Q: How do trains drink?
A: They chug.
 
The riddle was posted on the website Pun of the Day on January 3, 2017.
   
Twitter
Michael Grace
‏@RFYDNorg
January 3, 2017 - How do trains drink?... - How do trains drink? They chug. Comment On This Pun! http://ow.ly/AcHs508af4Z
6:01 AM - 3 Jan 2017
 
Twitter
Jokes of the day
‏@jokesofthedaydn
‘How do trains drink? They chug.’
6:10 AM - 3 Jan 2017
 
Twitter
Alan Jenkin
‏@alanjenkin
How do trains drink?
They chug.
8:00 AM - 3 Jan 2017
 
Odyssey
41 Punderful Jokes
At Shippensburg, Pennsylvania
Jan 16, 2017
(...)
19. How do trains drink? They chug.
 
Twitter
Novacco7
‏@Novacco7
@BatchyHD @TheFunPunGuy @MarleyThirteen How do trains drink? They chug. I win worst pun ever
6:37 PM - 26 Jan 2017
 
The Amazingly Lame Joke of the Day
Thursday, February 9, 2017
How do trains drink?
They chug.
Posted by Tim Wycislak at 4:24 AM