内容简介
Puff,Puff,PuffChug,Chug,ChugTwolittletrainsareheadingWest.Oneisashiny,streamlinedtrain,movingfast.Theotherisalittleoldtrain,movingnotsofast.Bothwilltravelthroughlongdarktunnels,throughsnowanddust.Whatelsecantheyhaveincommon?Muchmorethanyouthink!