Impetus Models Double Ended Sentinel. LNER Class Y10
As used on the Wisbech & Upwell and Yarmouth Docks.
Scale:  7mm (O gauge/scaleseven)
Material:  Etched Brass with Whitemetal Castings
Additional Parts Required:  Wheels, Gears, Motor, Solder, Flux, Paint, Transfers and Time & Patience.