I Love Trucks and I Love Trains, both written by Philemon Sturges and illustrated by Shari Halpern. Man I know these by heart now... great rhyming text and bold illustrations. The boy goes nuts for these.
"I like trucks that hoot and roar, as they rumble by my door" or how about "Some carry steel, some carry scrap, or secret stuff that's under wrap". "Trains trains trains.. i loooooooOOOOOve trains." See. Good stuff.