Clang, clang, clang," went the trolley,
"Ding, ding, ding," went the bell.
"Zing, zing, zing," went my heart-strings,
For the moment I saw him I fell.
"Chug, chug, chug," went the motor,
"Bump, bump, bump," went the brake,
"Thump, thump, thump," went my heart strings,
When he smiled, I could feel the car shake.

Google :-)

"clang, clang, clang goes the trolley... ding, ding, ding goes the bell."

http://www.google.de/search?hl=de&q=%22clang+...

--> possible explanation: It's out of a famous broadway show.

http://www.broadwayworld.com/board/printthrea...

Musical Nods to other Musicals (in the Music)
Posted by Jon 2007-02-10 20:05:55.0

Going WAY back - in [the musical] HIGH BUTTON SHOES, during the song "There's Nothing Like a Model T", the chorus sings:
Men: Let the trolley car Clang
Women: Clang Clang goes the trolley

as a salute to "Meet me in St. Louis".

Musical: "Meet Me In St. Louis":
Artist: Judy Garland
Song: The Trolley Song