3.5″ Derby 4F – First Loco Build

3.5″ Derby 4F – First Loco Build

Home Forums Locomotives 3.5″ Derby 4F – First Loco Build

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  • #813934
    mattleicester
    Participant
      @mattleicester

      Long-time lurker, first-time poster—finally taking the plunge!

      Like many, I was inspired as a kid by some truly legendary tinkerers—blokes who could turn a lump of metal into a steam-belching masterpiece with little more than a shed, a file, and an ambition to get out of the house. Naturally, I’ve been obsessed ever since.

      I’ve been around the forum for a few years, lurking in the shadows, admiring everyone else’s builds, and dabbling in the occasional stationary model. I also make my annual pilgrimage to the Midlands Model Engineering Show (a sort of engineering Glastonbury, but with fewer guitars and more boiler inspectors).

      For a while now, I’ve been sitting on the fence—Loco or Traction? Big wheels or rails? Decisions, decisions. To be honest, I’m not big on riding around on tiny trains, and I don’t live near a club where I could pretend I was. So traction engines had been quietly pulling ahead in the fantasy league…

      Then fate intervened—in the form of a suspiciously cheap, slightly dusty, half-started project I found abandoned at a local autojumble. It whispered, “Buy me, you know you want to,” and who am I to argue with the universe?

      So here it is—my intro and the start of what I hope will be a mildly entertaining (and mostly successful) build log. I’ve exchanged a few emails with Reeves2000 (very helpful folks), who confirmed the mystery machine is a Derby 4F. Plans are on the way, and once they arrive, I’ll share more. (obviously, not the plans)

      Looking forward to picking your brains and hopefully contributing something useful—or at least amusing—along the way.

      Matt / Stoney Stanton / Leicestershire

      12

      #813941
      John Billard 1
      Participant
        @johnbillard1

        I had no idea what to build for a first loco.  It was a Rob Roy. Decided by picking up the Martin Evans book  at a Harrods sale (really) and the wheels came up at our club for £1.

        John B

        #813943
        duncan webster 1
        Participant
          @duncanwebster1

          Looks like the Don Young design with Joy valve gear. Would have made Derby designers rotate in their graves at high speed. I’d run it through a valve gear simulator before cutting too much metal. Not saying it won’t work as drawing, but it might be improved, Joy isn’t the easiest to design

          #813945
          Andrew Crow
          Participant
            @andrewcrow91475

            It certainly looks like the Don Young design, in the ME article,  Don tried to explain why  he chose Joy valve gear as opposed to the original Stephenson’s.

            It is a fairly simple design to build and was serialised in ME in 1975/6.

            If you are looking for a Model engineering club there are at least 3 within a reasonable distance from you, ie Leicester, Rugby and North West Leicestershire.

            Andy

            #813983
            paul rushmer
            Participant
              @paulrushmer83015

              Hi I have not built a 4F but have driven one it was a very capable performer, it looks more like its big brother than my normal drive a LBSC princess marina. Good luck and enjoy the journey.

              Paul

              #815545
              mattleicester
              Participant
                @mattleicester

                Wow, thankyou all for your responses! thought id provide an update,

                I have reached out to a local Model Engineering Club (Rugby), where I will join.

                The plans have arrived!

                plans

                 

                New to this world so must admit, the comments about the Valve gear dont fill me with enthusiasm, So I tried to just ignore it, but couldntnt.. so

                and Ive found this post on here

                https://www.model-engineer.co.uk/forums/topic/joy-valve-gear-derby-4f/

                Where it makes reference to the original designer making an error during an original copy that transferred through

                ive checked these plans, on drawing #3 which appear to have the suspect measurement present

                 

                cc

                 

                which for now ive highlighted, and will take caution when i get to that particular part

                 

                #815601
                ben10
                Participant
                  @ben10

                  Hi does anyone know what this is worth and what it is model on? Thanks93d4097a-d320-4c52-b033-eea5ba6d59af

                  #815612
                  noel shelley
                  Participant
                    @noelshelley55608

                    Is there any paperwork with it ? What scale ? As a static model depending on quality of work, count in hundreds, with paperwork and a working model, a few thousand. Noel.

                    #815631
                    duncan webster 1
                    Participant
                      @duncanwebster1
                      On paul rushmer Said:

                      Hi I have not built a 4F but have driven one it was a very capable performer, it looks more like its big brother than my normal drive a LBSC princess marina. Good luck and enjoy the journey.

                      Paul

                      I’d still run it through a simulator, designing joy gear is tricky, you might as well get it as good as it can be, Don Young might have got it right, but it costs nothing to check

                      #815640
                      mattleicester
                      Participant
                        @mattleicester

                        I’d still run it through a simulator, designing joy gear is tricky, you might as well get it as good as it can be, Don Young might have got it right, but it costs nothing to check

                         

                        I am keen to have a go at this, can you signpost me to what tools etc I would need to simulate?

                        #815643
                        duncan webster 1
                        Participant
                          @duncanwebster1

                          here is one that should just work, but it’s quite old, and might not have survived the W11 updates. My version requires you to run Python, which isn’t difficult. If you send me your email via pm I will send you a copy of the article wot I rote for ME, which explains the basis of correction linkage

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