The first two locomotives, built in 1909, were numbered 753 and 754.

Before 1 January 1971 the locomotives were numbered 123.001-123.083 but from this date the class became 2301-2383.

These three locomotives were delivered in early 1954, and numbered 401-403.

In total 3 locomotives of this type were built, and numbered 15301-15303.

The locomotives were numbered in the 3-digit passenger series, with road numbers 350-359.

Within each group, locomotives were numbered in blocks which ran (low to high numbers) as set out below.

In total 69 2-6-0 locomotives of this type were built, and numbered 1301-1369.

The locomotives were numbered by the Army from 2041-2123.

As such the locomotives were numbered from 1400 up to 1545.

The 88 locomotives in this class were numbered 56301-88.