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Why does the 3-part train wheel have one wheel without the flange?

https://brickset.com/parts/4543943

Is this what real trains had?

Comments

  • madforLEGOmadforLEGO Chicagoland USMember Posts: 10,567
    edited October 2020
    Well IIRC that the middle wheel for LEGO design was to float over the rail as the train set that it initially came with ( #10194 ) had to float over the track around a curve or risk derailing the train from a standard LEGO curve.
    Astrobricksoldtodd33
  • 560Heliport560Heliport Twin Cities, MN, USAMember Posts: 3,241
    Yes, Lego train track curves are much sharper than real railroad tracks.
    Astrobricksoldtodd33
  • scottdd2scottdd2 ADELAIDEMember Posts: 145
    I can't get to my 10194 at the moment but I think that if the center wheel had a flange as well then it wouldn't fit between the 2 outer wheels as they are set close together.
    560Heliport
  • 560Heliport560Heliport Twin Cities, MN, USAMember Posts: 3,241
    ^ Good point! I have #75955 Hogwarts Express, same issue.
  • PaperballparkPaperballpark Near ManchesterMember Posts: 4,228
    edited October 2020
    It's actually quite accurate: https://en.wikipedia.org/wiki/Driving_wheel#Flangeless_wheels

    'Flangeless wheels
    Some long wheelbase locomotives (four or more coupled axles) were equipped with blind drivers. These were driving wheels without the usual flanges, which allowed them to negotiate tighter curves without binding.[9]

    Some three-driving-axle locomotives also had flangeless wheels on the middle axle , eg the NZR WH class.'
    560HeliportAstrobricks
  • Switchfoot55Switchfoot55 The Northwest, USAMember Posts: 2,865
    I appreciate this question being asked as I've always wondered what that extra wheel was in my #10254 Winter Holiday Train. It's clearly not included in the instructions. I was always afraid I was missing something. 

    For the Winter Holiday Train, is there a way to use the flangeless wheel in the original design? Or, would one need to increase the length of the engine and add another wheel for that to work? It appears I would also need some thin technic lift arms to accomplish the intended result. 
    560Heliport
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