On30 gauge
Summary
The following table lists the most popular narrow gauges in O scale:

On30 gauge

Section Title: Summary
Table Section Text: The following table lists the most popular narrow gauges in O scale:

Name	Scale	Model gauge	Prototype gauge	Used for

Op	1:45 or 1:43,5	9 mm (0.354 in)	300 to <400 mm	Continental European

Of (Oi)	1:45 or 1:43,5	12 mm (0.472 in)	400 to <650 mm	Continental European

On2	1:48	12 mm (0.472 in)	2 ft (610 mm)	American

O14	1:45 or 1:43,5	14 mm (0.551 in)	600 mm (1 ft 11 5⁄8 in)	Continental European, British

O14	1:43,5	14 mm (0.551 in)	610 mm (2 ft)	2 ft gauge railways in South Africa

On30 (On2½)	1:48	16.5 mm (0.65 in)	2 ft 6 in (762 mm)	American, Australian, Japanese

Oe	1:45 or 1:43,5	16.5 mm (0.65 in)	650 to <850 mm	Continental European

O-16.5	1:43,5	16.5 mm (0.65 in)	2 ft 6 in (762 mm)	British

On3	1:48	0.75 in (19.05 mm)	3 ft (914 mm)	American, Irish

Om	1:45 or 1:43,5	22.5 mm (0.886 in) and for finescale standard 22.2 mm (0.874 in)	850 to <1250 mm	Continental European

On3​1⁄2	1:43.5	22.5 mm (0.886 in)	3 ft 6 in (1,067 mm)	British

Sentence(s)

0e is the Continental European notation for 0 scale using 16.5 mm (0.65 in) track.

final_sentence: 0e is the Continental European notation for 0 scale using 16.5 mm (0.65 in) track.