There are two sets of published standards for O gauge trams; the first by the Tramway and Light Railway Society (TLRS) and the second by the O Gauge Guild. The TLRS standards can be found on their website follow this link:

http://www.tramwayinfo.com/Deftlrs.htm

The O Gauge Guild recognises that there are two sets of standards commonly in use; one using OO/HO gauge wheel tread profiles and the other O Gauge Fine Standard Profiles. However, the O Gauge Guild standards are only viewable on line by Guild members.

 

The key differences between the published standards for standard gauge trams are:

 

O Gauge Guild

TLRS

Flangeway

1.00mm (HO/EM profile wheels)

1.75mm (O gauge guild fine)

1.25mm straight track

1.5mm curved track

Back to back

30.5mm (HO/EM profile wheels)

29mm (O gauge guild fine)

30.3mm

Track centre

64mm

76mm