The X100 class is a group of diesel locomotive

Diesel locomotive

A diesel locomotive is a type of railroad locomotive in which the prime mover is a diesel engine, a reciprocating engine operating on the Diesel cycle as invented by Dr. Rudolf Diesel...

 built and operated by the New South Wales Government Railways

New South Wales Government Railways

The New South Wales Government Railways was the government department that operated the New South Wales Government's railways until the establishment of the Public Transport Commission in 1972. Although later known officially as the Department of Railways, New South Wales, it was still generally...

 of Australia

Australia

Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

.

History

A need existed for a small shunting unit that could handle the requirements at the smaller junction marshalling yards, larger intermediate stops and the workshop needs. To resolve this need, the X100, and later X200 class, was designed and built entirely in the system's own workshops from the early 1960s.

X100 class were two 0-4-0 centre-cab diesel-hydraulic shunting locomotives built at the NSWGR Chullora

Chullora, New South Wales

Chullora, a suburb of local government areas City of Bankstown and the Municipality of Strathfield, is located 15 kilometres west of the Sydney central business district, in the state of New South Wales, Australia, and forms a part of the Greater Western Sydney region.-History:The suburb of...

 Workshops.

They entered service in 1962 as the 80-class locomotives, but were re-classified as Shunting Tractors and renumbered as X101 and X102 before being allotted to Wauchope

Wauchope, New South Wales

-People from Wauchope:* Iva Davies - Musician, Icehouse* Alison Langdon - Channel Nine News Reader - Today Show* Phil Jamieson - Musician, Grinspoon* Andrew Stoner - NSW National Party of Australia leader, Member for Oxley...

 and Coffs Harbour

Coffs Harbour, New South Wales

-History:By the early 1900s, the Coffs Harbour area had become an important timber production centre. Before the opening of the North Coast Railway Line, the only way to transport large items of heavy but low value, such as timber, was by coastal shipping. This meant sawmillers on the North Coast...

.
Originally painted in a crimson red and cream colour scheme, they were later repainted in the standard Indian red with chrome lining.

Photos dated 1977 and 1983, show X102 in an all-over chrome yellow paint scheme and working in the Sydney area. X101 was in an all-over Indian-red scheme in 1979 and working at Wauchope.

X101, which was renumbered X212 in 1994, is now part of the SRA Heritage Fleet and is being restored by the Historic Electric Train Society. X102 Finished its service with the NSWGR in the Petersham Training School and is now with the Dorrigo Steam Railway and Museum

Dorrigo Steam Railway and Museum

The Dorrigo Steam Railway and Museum in Dorrigo, New South Wales, Australia is a large, privately owned collection of preserved railway vehicles and equipment from the railways of New South Wales, covering both Government and private railways...

. This unit is at Port Kembla, with 108 and 118.

They were confined to yard limits due to a lack of a "train brake" and as such could not be operated in the same way as regular locomotives. This limitation, and a need for greater tractive effort, lead to the development of the larger and more power X200 class.