There is metaphor, rythm, and rhyme
It means she's special
Metaphor
It has a metaphor, but not a simile. The whole theme of the song is a metaphor. Being stuck at a payphone, trying to reach her, but not having any money because he spent it on her is a metaphor for being stuck in the past, not able to reach her, and him being emotionally spent. A simile is a "like" or "as" comparison, and Payphone doesn't have a simile in the lyrics.
I don't know to what it refers in the USA but in the UK a slow train was one travelling between two towns but stopping at all of the stations in between. It was called £The Slow Train" because it used to take much longer than the express which would travel between the two stations non-stop The slow train was the return of Jesus Christ coming at the end of time. And as we know everything is done in GODS time not ours . Mankind has been waiting for the return of CHRIST for over 2,000 years which may only be a few minutes in GOD'S time
A metaphor for slow could be "like a turtle racing a snail."
Her laughter was music to his ears, a symphony that filled his heart with joy.
Time is a slow-moving river, winding its way through the valleys of our lives.
she's a mule because she is stubborn
A ship is a slow stroller in the sea.
Ron was a slow snail walking across the track with everyone passing him.
taking time in life to slow down.
The phrase "they plodded along on leaden feet" is a metaphor. It compares the heaviness of their steps to the weight of lead, suggesting a slow and laborious movement.
Fast a lightning, as swift as the wind (or an arrow). Or he or she is even as fast as Usain Bolt!
This is a metaphor... Similies are comparing two things using the words "like" or "as."Exaples: She moves slow as molasis. You run fast like a tiger.
Its a metaphor
It is a metaphor.