Cook is a railway station and crossing loop located in the Australian state of South Australia on the Trans-Australian Railway. It is 824 kilometres (512 miles) by rail from Port Augusta, 863 kilometres (536 miles) by rail from Kalgoorlie, and about 100 kilometres (62 mi) north of the Eyre Highway via an unsealed road. It is on the longest stretch of straight railway in the world, at 478 kilometres (297 mi), which extends from Ooldea, South Australia to beyond Loongana, Western Australia.

Cook is the only scheduled stop on the Nullarbor Plain for the Indian Pacific transcontinental passenger train and has little other than curiosity value for passengers strolling around while their train is replenished.

Cook was established in 1917 on the Nullarbor Plain when the Trans-Australian Railway was built. It is named after the sixth Prime Minister of Australia, Joseph Cook. When the town was a major Commonwealth Railways centre for track maintenance and locomotive and rolling stock repairs, it supported a school and hospital. At that time, railway employees and their families depended on two weekly provisions trains for the delivery of supplies. When the town was populated, water was pumped from an underground artesian aquifer but later, all water was carried in by train.

The short 1955 film Nullarbor Hideout was set in and around Cook; the first scenes give a good impression of the railway line and infrastructure, and a sense of the townspeople's isolation and their dependence on the railway.

In 2009, Cook was said to have a resident population of four. The town was effectively closed in 1997 when the Australian National Railways' assets were sold to railway operating company Australian Southern Railroad. Ownership was later transferred to National Rail Corporation, later becoming Pacific National after a trade for the Intermodal yard facilities at Alice Springs in 2004 in preparation for the opening of the railway to Darwin.

The reliability of modern diesel locomotives and the introduction of concrete sleepers and continuously welded rail rendered resident employees redundant. Track and facilities maintenance is undertaken by Australian Rail Track Corporation (ARTC) and diesel refuelling facilities remain for Intermodal train services and the Indian Pacific; there is overnight accommodation for resting Pacific National train crews.

The crossing loop can cross trains up to 1.8 kilometres (1.1 miles) long. The former airstrip is known as a place to spot inland dotterel.

As of 2016, Cook was officially described as an "unbounded locality" which is not used as an address. Since 2013, it has been administratively classified as being in the locality of Nullarbor.

• 
  The Indian Pacific train at Cook
• 
  Disused vehicles at Cook in 2011
• 
  Signs on a deserted building at Cook in 2005

• Localities on the Trans-Australian Railway

Preceding station	Journey Beyond			Following station
Rawlinna towards Perth		Indian Pacific		Adelaide towards Sydney