Ninety-seven, coal car, boxcar, caboose!

I'm working with a small group of second graders doing reading work for a half-hour. This week was my first week.
I have six second-graders in my group, two boys, four girls. One boy shows definite signs of wanting to be the small group clown. On Wednesday, I tried channeling his energy into more positive areas; I had him lead the group in some exercises in reading expressively. We also talked a bit about enunciation and pacing (one girl tends to rush). With all that in mind, I decided to bring in something special on Thursday.
I'd hinted about doing something cool, so when everybody saw the sheets of paper I passed out, they said, "Is that the fun thing?" But I instructed them to keep the pages turned to the back until we finished other activities.
Our small group clown dallied. I let everyone else who had finished turn the pages over while he continued to work. "If we don't get to the fun stuff because of you, the group's gonna be mad at you!" I warned. He picked up the pace.
At last he was done. I explained to the group that when I was just a little older than they are, I had discovered this poem and committed it to memory. I told them to pay attention to what happened as I recited it. They all had copies; I didn't, but our small group clown still thought I was cheating and looking at a page until I looked him dead in the eye as I rattled off my lines.
The poem was Crossing, by Philip Booth, and it goes like this:
"Stop Look Listen/as gate stripes swing down/count the cars hauling distance/upgrade through town:/warning whistle, bellclang,/engine eating steam/engineer waving/a fast freight dream:/B&M boxcar/boxcar again,/Frisco gondola/eight-nine-ten/Erie and Wabash,/Seabord, U.P.,/Pennsy tankcar,/twenty-two,three,/Phoebe Snow, B&O,/thirty-four,five,/Santa Fe cattle/ shipped alive/red cars yellow cars,/orange cars, black,/Youngstown steel/down to Mobile/on Rock Island track,/fifty-nine,sixty,/hoppers of coke,/Anaconda copper,/hotbox smoke,/eighty-eight,/red-ball freight,/Rio Grande,/Nickel Plate,/Hiawatha,/Lackawanna,/rolling fast/and loose,/ninety-seven,/coal car,/boxcar,/caboose!"
What happened, of course, was the poem sped up as the train sped up. "Do that again!" they said. This time I suggested they try reading along with me as I recited it. I asked them to guess how many cars were on the train; what was the last number and how many cars came after that?
They all took their copies with them. One little girl said, her eyes shining, "I'm going to take it home and memorize it this weekend and then I'll say it to you on Monday!"