I completed a seventh tractor trailer today. It will be my last for a while, giving me a total of 10 tractor trailers that run well and have very similar speed vs. voltage performance. This is a Corgi 1953 Mack B tractor - one of my favorite trucks. As with the others the Corgi chassis was used and 'Streets wheels and pickups fitted to it. The Navaho Lines trailer was on a Weaver flatcar and is powered as the others here with a truck from a WBB 44-tonner.
This is just a very good looking, good running model.
I do remember these trucks from when I was a kid. I was born in Colorado and by the time I was fifteen had lived in all four states listed on this trailer.
Several people asked to see details underneath, so here are photos.
I'm done making tractor trailers but not 'Streets vehicles. This "power unit" works so well: smooth running (flywheel), stable (heavy) and all at the same speed, that I am converting a couple of buses and some two and three-axle trucks, too, in the next week.