Aimed more towards then garden railway, G gauge is the most popular scale for garden railways, 16 mm scale has a dedicated and growing following especially in the UK. Model locomotives in this scale are often live steam scale models of British narrow gauge prototypes. 16 mm scale (which runs on 32 mm / 1.26 in) track, the same gauge as O gauge is probably now more popular in the UK than G scale.
garden railway’s scale tends to be in the range of 1/32 (Gauge 1) to 1/12 (1:12), running on either 45 mm(1.772 in) or 32 mm (1.26 in) gauge track. 1/32 scale (1:32) is also called “three-eighths scale” meaning 3/8 of an inch on the model represents one foot on the real thing. For similar reasons, 1/24 scale (1:24) is also called “half-inch scale”. Other popular scales are 1:29, 1:20.3 (representing 3 ft (914 mm) gauge prototypes on 45 mm (1.772 in) track, 16 mm (1:19). They are smaller than the Model Engineering layouts or what is commonly called a miniature railway, and would not provide a ride-on facility, being intended instead as a display railway.
Mechanical Horse relevant products:
The Mechanical Horse Club 