The TE1a was (surprise surprise) a development of the TE1; the main difference being the provision of a reversing lever instead of the throttle.It has a solid fuel burner tray, fitted into the "scuttle" so that the rear end of it's handle can act as a towing hook. The burner sits in the traditional Mamod black and chrome firebox at the rear end of the boiler.
The green boiler is longer than the similar one on the roller and wagon. The inside dimensions are, however, the same; the extra length being blanked off at the front end. This void is open to the smoke box. A standard 1/4" safety valve and a spring lever type whistle are also fitted. It has a water level sight "glass" (actually plastic) in the rear end. Boiler dimensions are 1 3/4" diameter x 6" overall length (4 7/8" long internally).
The engine is a single acting oscillating cylinder, with a reversing lever that shifts the cylinder to line up with the appropriate holes in the port face. The cylinder is 5/16" bore x 3/4" stroke. The flywheel drives one of the rear wheels directly through a drive band located in a groove in the outer circumference of the wheel.
The front axle is pivoted centrally, with a rod protruding up through the chimney, enabling an extension rod to be fitted for steering. The body is covered by a full length cream coloured canopy, attached to wire supports at the rear end and attached to the top edge of the chimney at the front end.Condition is good but not perfect. (It would have been better if the previous owner had completely emptied the boiler before transport!) As received, the front axle pivot was slightly bent, sugesting that the engine had been dropped at some time. This was easily corrected.