3D printable electric Ikea / Brio Train for wooden track

Ikea / Brio electric train design 2 of 3.  This one uses 2AAA battery box built into the cab.   A small micro miniature switch allows for on/off.   Ive included the instruction jpg files from the Youtube video  here.  Power comes from a 2 axle miniature motor and gearbox commonly found on Ebay.  Drive is with grooved wheels and elastic band tyres.  The design was inspired by ones recently published but I have redrawn the train using ProDesktop 8 and Tinkercad.  A small weight added to the front (10mm ball bearing) helps when climbing and pulling carriages up inclines and bridges.  The hitch was printed separately and uses a small ball magnet from a toy kit and is glued on once the best position is established.  I used silk PLA+ and would recommend supports for below the axles only.