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.
Technical specifications for 'Katie'.
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 (loading gauge) are :- length 280mm over buffers, width 125mm, height 155mm, weight 2.9 Kg (with r/c).
Full radio control is available for both regulator and reversing valve gear.
The wheels are adjustable between 32mm and 45mm gauge.