Den (left) and basis (right) a Rolls Royce Sentinel Diesel Hydraulic 0-4-0
Picture (right) from Nene Valley Railway's Barabel /photo credit Nene Valley Railway Blog with our thanks!

Upon aquiring the Sentinel brand in 1957, Rolls Royce began building these 325 HP 0-4-0 Diesel Hydraulic locomotives at the Sentinel Waggon Works, Shrewsbury, Shropshire. The locomotive pictured above-right - "Barabel" No. 10202, was first delivered to the Oxfordshire Ironstone Company on the 29th of December 1964. Barabel, in preservation since 2006, can be found today at the Nene Valley Railway in Peterborough, England.

Collector's Corner
LC Wooden Den from Amazon UK and US Take-n-Play Den available from Amazon UK and US
Wooden Railway model of Den Take-n-Play Den