After interactively exploring ambulances, police cars and more in Emergency!, Margaret Mayo and artist Alex Ayliffe take on trains, planes, boats and other modes of transport for the paper-over-board Choo Choo Clickety-Clack! Sound effects galore will have youngsters chiming in (bikes go ""Zippety-Zip!""; cable cars go ""Shlummp! Whurrrr!""). .