From the Loftsmith community

Loftsmith Rails HO GP40 (flared radiator)

A little diesel for your HO layout, ready to roll down the track and sit at the head of a freight train. It has a long hood, a flared radiator at the back and a numbered cab. Change the frame length and the road number to match the engine you want.

4 parts · 93 g · 198 × 34 × 54 mm

by Rylan

Orange HO scale diesel locomotive with a dark roof, long hood and flared radiator, sitting on a pair of rails
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No adjustable sizes

Ask for the sizes you want to tweak, e.g. “make the width adjustable”.

Parts

  • gp40-body · PLA · Upright on the flat frame underside

    Orange body, filament 1. The paint-dark (charcoal roof, filament 3) and paint-trim (white lettering, filament 2) parts print inside it.

  • fuel-tank · PLA · Small face down

    Glue its two pegs into the sockets under the frame.

  • truck ×2 · PLA · Upright on its flat bottom

Print settings

Layer height
0.12-0.16 mm
Walls
2
Infill
15%
Supports
None
Notes
Slot 1 orange (body), slot 2 white (lettering and logo), slot 3 charcoal (roof). Expect a prime tower. The report estimates about 150 colour changes and a lot of purge (~80 g). One colour plus hand paint is the cheap option. The handrails are 1.4 mm thin; handle them gently.

Hardware

  • 4 × 33 in HO metal wheelsets (25.3 mm axles) · Optional for a display model.
  • 2 × M2 x 10 screws · Truck pivots, if you want the trucks to swivel.
  • CA glue or plastic cement · For the fuel tank pegs.

Assembly

  1. Glue the fuel tank pegs into the two sockets under the frame, between the trucks.
  2. Press a wheelset into each truck's axle cones, then screw each truck to the frame with a loose M2 screw (optional on a display piece).

Good to know

  • This is a display shell, not a runner: no motor, lights or couplers.
  • The report flags thin ledges on the body. They are the cab-window recesses and door grooves, kept on purpose.
  • The report warns about slender members; those are the thin handrail posts. They are fragile but fine for display.
  • Nothing is test-printed. Check the fuel tank peg fit first.

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