More About Thomas the Tank Engine is the thirtith book in the Railway Series. It was written by Christopher Awdry and illustrated by Clive Spong. Stories; Thomas, Percy and the Coal Thomas is bragging that blue is the only suitable colour for a Really Useful Engine, but soon gets his just desserts when Percy is delivering coal next day, and some coal falls out of a truck, causing Thomas to get covered in coal dust - from smokebox to bunker! Thomas is cross, and accuses Percy of doing it on purpose. The feud worsens and, several days later, Percy is about to get some water, but crashes through faulty buffers and into the coal bunker, getting covered in coal dust himself- just as Thomas leaves, delighted and amused.