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Loco specification

The specification of the DEErivative models is mostly as per the the DEE book, but with the following improvements:-

  Frames - Laser cut stainless steel - 1.5mm 304B for DEE, probably etched Nickel Silver (1mm) for later locos
    correct shape for loco and tender - except: - cutout for front bogie wheels
  Sprung axleboxes - normally running on bump stops,
               but wheels are pushed into depressions in track, axleboxes retained by "silhouette" springs
               Later locos may be compensated rather than sprung.
  Bogie - compensated, dummy low-relief springs and compensator bar
  Buffer beams - Multi-layer etches with etched overlays
  Coupling rods - correct 3D profile
  Scotch crank - eccentric extended to clamp half axles for easy assembly and quartering
                          Later locos will use Slaters wheels with square axle ends
  Axle pump - increased to 1/4" diameter
  Drain cocks - disc type, with O-rings to provide both seal and spring - may be automatic on later locos
  Lubricator - solid top pattern, directly plumbed into front of cylinder block
           with O-ring seal and no drain outlet - uses a syringe to empty - simpler to use, less messy!
  Valve gear - Marshalls - for r/c reverse. DEE uses slip eccentric with corrected timing
  Boiler - JVR C-type (B-type for DEE) with electronic LED water level display
  Safety valve - uses O-ring for seal
            correct shape tubes and base
  Platework - correct shape crank splashers
  Tender - well tank fitted
         no hand pump fitted - supplied with Enots type valve and garden spray (produces up to 300psi)
  Meths version has sump built into well tank with vaporiser burner instead of wicks, fitted with combined
                 draught shield/lighting tray/drip tray
  Gas tank is bottom feed liquid version with pre-heat loop around boiler backhead
  Wheels - insulated (not DEE), separate tyres - correct 21 spoke drivers for SECR D class

Added parts (mostly cosmetic):-
  Loco   sprung buffers                             Tender   sprung buffers
        coupling hooks                                    coupling hooks
        flexible vacuum hoses                          flexible vacuum hoses
        lamp brackets                                      lamp brackets
        handrails - main, front steps,                handrails - front and rear
            cab side, valve chest cover
        smokebox lubricators (4)                    dummy brake stanchion
        dummy clack valves                            fire iron hooks
        sandboxes, pipes and filler lids            dummy springs and hangers
        steam reverse pump & control rod      working axlehorns and
                                                                       correct pattern axleboxes - later locos compensated
        brake hangers                                     brake hangers
        brake rods (not DEE)                         brake rods (not DEE)
        brake shoes                                        brake shoes
        dummy ashpan sides                           toolbox doors with handles
        dummy whistle
        handrail stanchions                              handrail stanchions
        guard irons                                         guard irons
        fall plate and doors between loco and tender
        sliding roof vent
        Dummy backhead (not DEE)

There are many other detail changes to the design as specified in the book -
        sometimes to improve manufacture
        sometimes because I am not limited by manually controlled lathe and mill

The above specification is mainly for the SECR D class 4-4-0. Details will vary for other loco classes, but will generally be to the same standard or better.