The fitting of tapered boilers to the 433Cs was as much of a disappointment as it was with the 344E. Above the footplate the appearance of the two classes remained virtually identical, as did the problems they shared below it. The rear bogies still refused to follow the track and the ashpans still needed raking and digging out twice a day.  Like their cousins, the 344E and 344EE 4-6-4s, the 433Cs and 433CCs were only really brought up to scratch by the rebuilds of 1950.