Some miniature and light railways in the United Kingdom. These are railways, often but not always by the seaside, that are large enough to ride on.
For the museum at Cleethorpes on the history of these little railways see Rails to the Sands
Audley End Miniature Railway, Essex
Beale Park Narrow Gauge Railway, Berkshire
Cleethorpes Coast Light Railway
Downs Light Railway Trust, Colwall, near Malvern, Worcestershire
Eastleigh Lakeside Steam Railway, Hampshire
Exbury Gardens and Steam Railway, Exbury, Southampton
Kerr's Miniature Railway, Arbroath, Scotland - two web sites, neither fully working when I checked. Kerr's Miniature Railway (under construction) and [ http://www.kerrsminiaturerailway.co.uk/ Kerr's Miniature Railway]
Kirklees Light Railway, Yorkshire
Lappa Valley Steam Railway, Cornwall
Lincolnshire Coast Light Railway, Ingoldmells, near Skegness, Lincolnshire
North Bay Railway, Scarborough
Perrygrove Railway, Coleford (Forest of Dean), Gloucestershire
Ravenglass and Eskdale Railway, Lake District
Romney, Hythe and Dymchurch Railway
Royal Victoria Railway, Netley, Southampton, Hampshire
Rudyard Lake Steam Railway, near Leek, Staffordshire
Sherwood Forest Steam Railway, Nottinghamshire
Shibden Miniature Railway, Yorkshire
South Downs Light Railway, Pulborough, Sussex
Stapleford Miniature Railway, near Melton Mowbray, Leicestershire
Vanstone Woodland Railway, Codicote, Hertfordshire
Windmill Farm Railway, Burscough, Lancashire
I have only listed a handful above. See more at Miniature Railway World