There were some fairly odd looking locos at work on the timber tramways here in New Zealand. Many were built in the tramway workshops using a boiler from here and a stationary steam engine from there. Chain drive over big coarse spockets made the wheels turn so they were very simple locomotives indeed. Generally they only travelled at walking speed, but could haul a big load over the rough and ready light trackwork used on the logging tramways.
I put together this little loco over the course of an afternoon. At the moment it's unpowered, but soon I'm going to have a bit of a mess about and put a motor in it. In case anyone is wondering the tyre on the top of the chimney is meant to be the primitive type of spark arrestor that was commonly used on these locos.