HO scale
Videos
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 apart for modelling 1,435 mm standard
HO-scale (1:87) model of a center cab switcher locomotive 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.
OO gauge
Videos
OO gauge or OO scale is the most popular standard gauge model railway standard in the United Kingdom, outside of which it is virtually unknown. OO gauge is one of several 4 mm-scale standards, and the
HO scale
…developed in response to the economic pressures of the Great Depression. The trains first appeared in the United Kingdom, originally as an alternative to 00 gauge, but could not make commercial headway against the established 00 gauge. However, it became very popular in the United States, where it took off in the…
UK prototype model of a OO scale (1:76) British Rail Class 25 shown with an 18.0 millimetres (0.71 inches) diameter five pence coin
Hornby Railways Flying Scotsman locomotive on an OO gauge layout
Class 800 Euston Road 00 gauge model Railway at the NEC
OO scale (left) and HO scale (right) models of the EMD Class 66, showing the size difference.