As of 2008, 32 locomotives have been ordered, with options for a further 29:

In 1910 a somewhat heavier and larger locomotive was ordered from Hanomag.

Another ten locomotives were ordered and delivered a year later.

Another very similar locomotive was ordered home in 1935.

A further 4 locomotives and 10 passenger coaches were also ordered.

In 1938 a further ninety-five locomotives were ordered, built by three manufacturers.

Therefore a further ten locomotives of the original design were ordered from Brighton works.

A fourth locomotive, identical to the first three, was ordered from the same manufacturer in 1911.

The locomotive proved successful and was ordered in large numbers.

Additional locomotives were ordered as a result of this study, including the 5000.