HO scale
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HO or H0 is a rail transport modelling scale using a 1:87 scale. It is the most popular scale of model railway in the world. The rails are spaced 16.5 millimetres (0.650 in) apart for modelling 1,435 mm standard gauge tracks and trains in HO.
HO scale (1:87) model of a center cab switcher made by Bachmann, shown with a pencil for size comparison.
HO scale model of a CSX locomotive
First model railroad layouts in today's H0 gauge, 1926
HO scale steam locomotives at the N&W RR museum in Crewe, Virginia.
Slot car
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A slot car or slotcar is a powered miniature automobile or other vehicle that is guided by a groove or slot in the track on which it runs. A pin or blade extends from the bottom of the car into the slot. Though some slot cars are used to model highway traffic on scenic layouts, the great majority are used in the competitive hobby of slot car racing or slot racing.
Modern commercially made slot cars and track. Ninco, 1:32 scale.
A typical, 1:32 scale, Audi R8R slot car by Carrera
An Aurora "Thunderjet-500" HO chassis and motor, 1963-1971.
Digital track (SCX, 1995). Digital technology allows cars to change lanes at crossing points and passing-lane sections.