Katie is of typical narrow gauge saddle tank locomotive design. Though not a model of any particular engine, she draws inspiration and features from a number of famous builders like Hunslet, Bagnall and Pecket etc.
* 0-4-0 outside framed chassis with two double acting slide valve cylinders operated by simplified Walschaerts type valve gear.
* Internal gas firing using the ROUNDHOUSE 'FG' gas system.
* Controls fitted as standard are :- steam regulator, safety valve, pressure gauge, displacement lubricator, gas regulator and reversing gear.
* Dimensions are :- length 280mm, width 125mm, height 165mm, weight 2.9 Kg (with r/c).
* Full radio control is available for both regulator and reversing valve gear using Planet 2.4GHz equipment.
* The wheels are adjustable between 32mm and 45mm gauge.
* Also available with insulated wheels.
* Available in any standard ROUNDHOUSE colour.
* Minimum radius 2 feet.