The OO gauge, 1:76.2 in size, is the most popular scale of model in the United Kingdom. OO gauge models are widely available, as are the carriages, track and scenery for use with them. OO gauge models can often use HO scale track, offering an even wider choice of model track. Highly detailed collectors models are available, as are less detailed and more durable toys. As is the case with many of the smaller scales of train, these trains are most suited to indoor use. The OO gauge is a popular choice for those who emphasise the operation of their models over assembly and display.