Come you, cartoonists,
Hang on a strap with me here
At seven o’clock in the morning
On a Halsted street car.

Take your pencils
And draw these faces.

Try with your pencils for these crooked faces,
That pig-sticker in one corner—his mouth—
That overall factory girl—her loose cheeks.

Find for your pencils
A way to mark your memory
Of tired empty faces.

After their night’s sleep,
In the moist dawn
And cool daybreak,
Faces
Tired of wishes,
Empty of dreams.

Carl Sandburg

http://www.poemhunter.com/poem/halsted-street-car/