Boys Chuggington Pajamas. Chugga chugga chugga chugga…Chuggington! Now your little one can ride the rails into dreamland when they wear these traintastic Chuggington jammies to bed! The blue pajama top showcases main characters Wilson, Koko and Brewster and is paired with matching pj bottoms that feature a repeat pattern of the three friends and their names. These pjs will be a hit with all Chuggington fans!