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There have been many questions asked about Wardale's choice of valve gear for the 5AT and associated issues relating to balancing and "hammer blow".  Some of the questions and answers are covered in this section.

The following questions are included in this section:

• Why use Walschaerts valve gear?
• Why not use Baker valve gear?
• Why not use British Caprotti valve gear?
• Won't the piston speed be too high?
• Why not use three cylinders?
• What about hammer blow?
• Why were piston tail rods not used in latterday designs?