Hi Daniel
That is quite the impressive consist to be hauled by a little single cylinder oscillator!The cylinder is a Mamod double acting one, a pair of which are used on their locomotive. The drive train uses Meccano gears, sprockets and chain that give about a 5:1 reduction to the axle. The models wheels are brass Meccano flanged wheels.
The traction is remarkable, what is seen in the video might be considered a light load; some months earlier at an open day at the model engineering club I belong to we ran out of wagons that would couple. The wheels, axle boxes and saddle are 3.5" gauge castings. The heavier load is seen towards the end of the video.
https://youtu.be/Ok_NALMqico?si=gwtaH1mSLh6Y1mhJ Hi Jim, Glad you like it.
Take care Tony.