The Penrhyn 'main line' engines were built by the Hunslet Engine Company; Charles in 1882 and the Ladies in 1893. Charles remains in Penrhyn Railway form, as a static display in Penrhyn castle, whereas Linda and Blanche have seen many years further service on the Festiniog Railway. Over these years, the locomotives have had numerous changes including oil firing and the addition of a leading pony truck. As the real engines all have detail differences, the models are being produced in the following formats:

Charles: In Penrhyn format with a full cab back sheet with characteristic square spectacles, tank mounted sandboxes, Roscoe lubricators and other pertinent detailing

Linda or Blanche: In Penrhyn format as Charles but with round spectacles and small sandboxes on tank front.

Linda: In early Festiniog form (1960's) i.e. with tender and open backed cab, still 0-4-0, re-profiled roof, twin (dummy) whistles, larger sandboxes, vacuum pipes and so on.

The models are supplied with name and works plates and are available in any of the Roundhouse colours, with Black being suitable for the Penrhyn engines and green for Linda as a Festiniog locomotive.

Available as manual or two channel radio control, the radio being situated in the tender or in an additional coal truck for Charles and the Penrhyn version of Linda or Blanche to tow.

Features include a water level gauge, water top up facility, pressure gauge, displacement lubricator etc. The boiler is internally gas fired with the tank in the cab. The models are adjustable for 32mm (as the originals) or 45m gauges.

Dimensions (excluding tender or truck): length 305mm, width 105mm, height 135mm.