Question:  The Railway Hotel was used in a film about what Cambodian regime?

Context paragraphs:
The Railway Hotel, Hua Hin: The Railway Hotel is a historic hotel in Hua Hin, Thailand.  It was used as the Hotel Phnom Penh in the 1984 film "The Killing Fields".

The Killing Fields (film): The Killing Fields is a 1984 British biographical drama film about the Khmer Rouge regime in Cambodia, which is based on the experiences of two journalists: Cambodian Dith Pran and American Sydney Schanberg.  It was directed by Roland Joffé and produced by David Puttnam for his company Goldcrest Films.  Sam Waterston stars as Schanberg, Haing S. Ngor as Pran, Julian Sands as Jon Swain, and John Malkovich as Al Rockoff.  The adaptation for the screen was written by Bruce Robinson; the musical score was written by Mike Oldfield and orchestrated by David Bedford.

Railway Hotel, Edgware: The Railway Hotel is a former pub and hotel in Station Road, Edgware and a Grade II listed building with Historic England.  The building is currently (February 2017) being used as a used car lot.

Camborne railway station: Camborne railway station serves the town of Camborne, Cornwall, England, United Kingdom.  It is located on Trevu Road in the town, adjacent to a level crossing and the Railway Hotel.  It has been in use since 1843 and is currently managed by Great Western Railway.  Services are provided by them and CrossCountry.

Coalville Town railway station: Coalville Town was a railway station at Coalville in Leicestershire on the Leicester to Burton upon Trent Line.  Passenger business was carried out at the "Railway Hotel" when the line opened in 1833 until the first Coalville station was opened by the Midland Railway in 1848, replaced in 1894 and closed in 1964, although the line remains in use for freight.

Malmaison Hotel, Reading: The Malmaison Hotel Reading (formerly the Great Western Hotel) is a grade II listed hotel in the town of Reading in the English county of Berkshire.  It is situated at the junction of Blagrave Street and Station Road, directly opposite the main entrance to Reading railway station.  It was opened in 1844, shortly after the Great Western Railway opened its line from London, and is thought to be the oldest surviving purpose-built railway hotel in the world.

Chateau Qu'Appelle: The Chateau Qu'Appelle was a Grand Trunk Pacific Railway hotel planned for Regina, Saskatchewan.  Construction was started in 1913 at the corner of Albert Street and 16th Avenue (now College Avenue).  Rising costs, labour and material shortages, and the bankruptcy of the railway stopped the project before it was completed.  The unfinished structure was eventually dismantled.

Khun Srun: Khun Srun / ឃុន ស្រ៊ុន (1945–1978) was an important Cambodian writer.  He was born in Char village, Roveang commune, Samrong district, Takéo province, into a poor Chinese Cambodian family.  When he was eight, his father, Khun Kim Chheng, a Chinese man who had fled Communism, died, and he and his six siblings were raised by his mother, Chi Eng, a small shopkeeper and a devout Buddhist.  He began his schooling during the country's first years of independence, when the doors to higher education and professionalization were inching open to all Cambodians, regardless of their social and economic class.  A brilliant student, he studied Khmer literature and psychology at the university in Phnom Penh, becoming widely read in the sciences, mathematics, and European literature.  Amid the turmoil of the 1960s, he worked as a professor of mathematics and a journalist while writing fiction and poetry.  He also worked as a member of the textbook editorial committee at the Ministry of Education.  In less than four years, he published three collections of poems, short tales, and philosophical anecdotes; two collections of autobiographical short stories, "The Last Residence" and "The Accused"; and a final volume of poems, "For a Woman".  He was influenced by both existentialism and Cambodian Buddhism.  In 1971, he was imprisoned during 7 months by the right-wing Lon Nol government for refusing to collaborate, but still refused to align himself with the extreme left.  In 1973, after being imprisoned for a second time, he finally joined the communist guerrillas.  He was only 28, and his life as a writer was finished.  After the Khmer Rouge took power, in 1975, Khun Srun (aka Phoeun - ភឿន) was assigned work as a railway engineer).  On the 20th of December 1978, he, his wife and their two youngest children were victims of the last purges.  They were arrested, transferred to Tuol Sleng prison and probably killed in Choeung Ek, few days before the end of Pol Pot's regime.  Only Khun Srun's nine-year-old daughter, Khun Khem, survived, taken by the Khmer Rouge and forced to live among them in the forest on the Cambodian-Thai border.

Kampuchean United Front for National Salvation: The Kampuchea (or Khmer) United Front for National Salvation (Khmer: រណសិរ្សសាមគ្គីសង្គ្រោះជាតិកម្ពុជា ; KUFNS), often simply referred to as Salvation Front or by its French acronym FUNSK ("Front Uni National pour le Salut du Kampuchéa"), was the nucleus of a new Cambodian regime that would topple the Khmer Rouge and later establish the People's Republic of Kampuchea (PRK).

Listed buildings in Alderley Edge: Alderley Edge is a civil parish in Cheshire East, England.  It contains 30 buildings that are recorded in the National Heritage List for England as designated listed buildings. Of these, one is listed at Grade I, the highest grade, one is listed at Grade II*, the middle grade, and the others are at Grade II.  The parish contains the village of Alderley Edge, which became a dormitory settlement for workers in Manchester following the arrival of the railway in 1842.  Included in the listed buildings are mansions for the more wealthy businessmen.  In the countryside surrounding the village are listed houses, cottages, and farm buildings.  Within the village, in addition to houses, the listed buildings include a former railway hotel, churches, a school, a bank, a drinking fountain, a war memorial, and a garage.

Supporting paragraphs: The Railway Hotel, Hua Hin The Killing Fields (film)
Answer: Khmer Rouge