This weeks riddle
Word Pyramid III

Each missing word is an anagram of the one before including one additional letter. Can you find them all?

Down by the tracks, Fred the ? looked up at a ? whilst sat upon a ?. As the ? went by, he sat just ?. Bill the ? fluttered down and started nattering about geometry and home-decorating - he was fascinated with ? and ?. Unfortunately he had forgotten about the 23:02. As Bill got a good ?, Fred's screams were ?.