There have been numerous iterations of the humble Stainz loco over the decades and many design changes to improve detailing as well as servicing accessability. The early two-halves gearbox was a bit of a bear to service. The later design had a top access gearbox, where the old motor could easily be removed. Improved cab detailing, constant low voltage (5 V) circuitry for lighting and smoke units, front and rear light bezels, detailed plastic running gear and even a rudimentary chugging sound were just a few of the many improvements made over the decades of production of the ubiquitous Stainz.
