This kit is of the Super Sentinel steam wagons. These were of the ‘undertype’ design – with the engine mounted under the floor.
Sentinel Waggon Works Ltd was a British company based in Shrewsbury, Shropshire that made steam-powered lorries, railway locomotives, and later, diesel engined lorries, buses and locomotives.
The Super Sentinel was introduced in 1923. They were built in a new plant is Shrewsbury using a production line like that used for the Ford Model T – one of the first in the UK.
Overall, 1550 Super Sentinel steam wagons were produced, the last 2 were built in 1958.