OK, so that's what happens when your kids ask you to make a "like no other" locomotive for them :)
Now you can make one for yourself if you have just basic 3D printer! The complete set of printable 3D parts (STL files) is ment to be easy to handle.
The model is suited for printing on a smaller working area machines (FDM: 150 x 150mm).
Doesn't need any support while being printed.
For better fit some parts may need delicate sanding before applying glue.
Wheel axles are recomended to be made of 1.5mm steel wire. Hinges work very well with 1,75 filament insets.
You can skip file "Diesel01_part_A5.stl" if you don't need motor.
Have fun :)
I'd be happy to hear any comments and questions regarding this one!
Higher res. photos can be found here:
PS 1: dimensions of fully assembled model:
Current version has couplers and is ready for use with cars that will be published some time soon..
PS 2: Assembly explanation pdf is now freely available:
PS 3: Various "Lego type" tracks are also available freely for download & printing nowadays.. e.g. here: http://www.thingiverse.com/thing:26734
PS 4: You can make this model match one of popular market track sizes (32mm), by scaling it down with 0.847 factor before printing.