Above: A Johnston 16-wheeler. The two-cylinder engine is mounted vertically at the rear of the cab.
The Johnston 16-wheelers were used for logging in New Zealand, running on wooden rails. This version, with four powered bogies, was built under a Patent issued in 1909. It resembled a Shay in having a vertical engine, but the drive shafts and the many universal joints required were more tidily placed between the frames.
Presumably this is denoted as a 2-2-2-2-2-2-2-2, or possibly a 2-2 + 2-2 + 2-2 + 2-2. I would happy to hear from those with strong opinions on this point.
At least 16 were built between 1910 and 1937.
Above: The drive shafting of the Johnston. Drawing taken from the original Patent.
