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

full_context: Document 1: David Belton: David Belton is a director, writer, and film producer. His experiences as a BBC reporter covering the 1994 Rwandan Genocide led him to write the original story and produce the film "Shooting Dogs", directed by Michael Caton-Jones, which dramatizes the events at the Ecole Technique Officielle. It was retitled "Beyond the Gates" for its 2007 U.S. release. He has directed documentaries (for the BBC, "Simon Schama's Power of Art", "The Silent War") and drama-documentaries and documentaries for PBS ("God in America" and "The Amish") and dramas for the BBC ("Ten Days to War"). His book, "When the Hills Ask for Your Blood" was published in January 2014 by Doubleday.
Document 2: 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.
Document 3: Sanam Chandra Palace Railway Halt: Sanam Chandra Palace Railway Halt is a railway halt located in Phra Pathom Chedi Subdistrict, Nakhon Pathom City, Nakhon Pathom. It is located 49.798 km from Thon Buri Railway Station. It is located near Sanam Chandra Palace, and used to have a royal pavilion, however this was moved to Hua Hin Railway Station.
Document 4: Hua Takhe Railway Station: Hua Takhe Railway Station is a railway station located in Lat Krabang Subdistrict, Lat Krabang District, Bangkok. It is a class 1 railway station located 30.911 km from Bangkok Railway Station. This station is the nearest station to Suvarnabhumi Airport, as well as the nearest large railway station to King Mongkut's Institute of Technology Ladkrabang. However, the nearest railway station to KMITL is Phra Chom Klao halt, located only 580 m from Hua Takhe Station. Hua Takhe is also the junction (although not officially one) for the freight-only line to the Inland Container Depot (ICD)
Document 5: Enemies of the People (film): Enemies of the People is a 2009 British/Cambodian documentary film written and directed by Rob Lemkin and Thet Sambath. The film depicts the 10-year quest of co-director Sambath to find truth and closure in the Killing Fields of Cambodia. The film features interviews by former Khmer Rouge officials from the most senior surviving leader to the men and women who slit throats during the regime of Democratic Kampuchea between 1975 and 1979.
Document 6: 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.
Document 7: Swimming to Cambodia: Swimming to Cambodia, also known as Spalding Gray's Swimming to Cambodia, is a 1987 American film written by and starring Spalding Gray, and directed by Jonathan Demme. The performance film is of Gray's play and monologue, which centered on such themes as his trip to Southeast Asia to create the role of the U.S. Ambassador's aide in the film "The Killing Fields", the Cold War, Cambodia Year Zero, and his search for his "perfect moment". The film grossed slightly over $US1 million.
Document 8: First They Killed My Father (film): First They Killed My Father (Khmer: មុន​ដំបូង​ខ្មែរ​ក្រហម​សម្លាប់​ប៉ា​របស់​ខ្ញុំ "Moun​ dambaung​ Khmer​ Krahm​ samleab​ ba​ robsa​ khnhom") is a 2017 biographical historical thriller film directed by Angelina Jolie and written by Jolie and Loung Ung, based on Ung's memoir of the same name. Set in 1975, the film depicts 5-year-old Ung who is forced to be trained as a child soldier while her siblings are sent to labor camps during the Khmer Rouge regime.
Document 9: 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.
Document 10: Rogue Films: Rogue is a Commercial, TV, music video and documentary production company, originally organised under the name of Drum Films in 1974, as part of The Moving Picture Company. In 1983 Michael Green purchased both companies, making them part of his Carlton Communications. Renamed Rogue Films in 1992, the company became an independent entity in 1998, and represents award-winning British directors, such as Academy Award winner Kevin Macdonald ("One Day in September", "Last King of Scotland", "Life in a Day") and Grammy Award-winning Sam Brown (music videos for Adele, Jay-Z and Foo Fighters).
Document 11: Roland Joffé: Roland Joffé (born 17 November 1945) is an English-French film director who is known for the Oscar-winning movies "The Killing Fields" and "The Mission". He began his career in television. His early television credits included episodes of "Coronation Street" and an adaptation of "The Stars Look Down" for Granada. He gained a reputation for hard-hitting political stories with the series "Bill Brand" and factual dramas for "Play for Today".
Document 12: Mandarin Oriental, Bangkok: Mandarin Oriental, Bangkok is a five-star hotel in Bangkok owned in part and managed by Mandarin Oriental Hotel Group. Located on the banks of the Chao Phraya River, the original structure was the first hotel built in Thailand when it opened as The Oriental in 1876. Today, the hotel is one of two flagship properties of Mandarin Oriental Hotel Group and is known for service, which consistently places it among the world's best hotels ("see" Awards).
Document 13: Hanoi Railway Station: Hanoi Railway Station is one of the main railway stations on the North–South Railway (Reunification Express) in Vietnam. It serves the city of Hanoi. The station is located at 120 Lê Duẩn Street, Cua Nam Ward, Hoan Kiem District of Hanoi and is the starting point of five railway lines leading to almost every Vietnamese province. Train street is very famous narrow gap railway line were train moving very tight space inbetween old houses in HaNoi.
Document 14: The Killing Fields (album): The Killing Fields is the 10th record album by Mike Oldfield, released in 1984 on Virgin Records. It was the soundtrack album for the British drama film of the same name based on the experiences of two journalists in the Khmer Rouge regime in Cambodia. It is the only full-length film score written by Oldfield.
Document 15: 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".
ground_truth: Khmer Rouge