Humpty Doo is a small town in Australia's Northern Territory, situated just south of the Arnhem Highway, approximately 40 km from Darwin.
 At the 2016 census , Humpty Doo had a population of 4,380 people.
 Its local government area is Litchfield Municipality.
 The town is a popular stopping point for tourists travelling between Darwin and Kakadu National Park, and boasts many attractions of its own.
 The main industries are agriculture and tourism; however, most residents commute to Darwin or Palmerston for work, and many regard it as a dormitory town.
Theobalds Grove railway station serves Waltham Cross in Hertfordshire, England.
 It is part of the Lea Valley Lines network, and train services are provided by London Overground.
 The station is named after the nearby Theobalds Park.
Waltham Cross is a suburban dormitory town 12 miles NNE of central London and located within the metropolitan area of London, the Greater London Urban Area, and the Borough of Broxbourne in Hertfordshire.
 It is immediately north of the London Borough of Enfield and is the most southeasterly town of Hertfordshire, located immediately north of the M25 motorway.
 The Waltham Cross post town additionally includes the neighbouring town of Cheshunt and a small part of Enfield.
St Albans , is a city in Hertfordshire, England, and the major urban area in the City and District of St Albans.
 It lies east of Hemel Hempstead and west of Hatfield, about 19 mi north-northwest of central London, 8 mi southwest of Welwyn Garden City and 11 mi south-southeast of Luton.
 St Albans was the first major town on the old Roman road of Watling Street for travellers heading north, and it became the Roman city of Verulamium.
 It is a historic market town and is now a dormitory town within the London commuter belt and the Greater London Built-up Area.
Chitungwiza – known colloquially as Chi Town – is a high-density dormitory town in Zimbabwe.
 It is approximately 30 kilometres south-east of the Harare city centre.
 It was formed in 1978 from three townships: Seke, Zengeza, and St Marys.From early 2000s another township named Manyame Park (New St Marys) was established making them four.
Luoma (Finnish) or Bobäck (Swedish) was a station on the VR commuter rail network located in Kirkkonummi, Finland, between the stations of Mankki and Masala.
 The station had two tracks, with track one serving trains towards Kirkkonummi and track two towards Helsinki.
 The station was opened in 1932, then named as Nokka.
 In that time, there was an other station named Luoma, located about a kilometer more towards Helsinki.
 The station was out of use between 1944 and 1956, as the Porkkala Cape served as a Soviet military base and the frontier passed through the station.
 When the original Luoma station was abolished in 1978, the Nokka station was renamed as Luoma.
 Because of very low number of passengers, the station was closed 27 March 2016.
Holambi Kalan is a suburban area in the Narela Sub Division of the North West Delhi district of Delhi, India.
 The area has a railway station named Holambi Kalan (Station Code: HUK).
 Its distance from Delhi Junction railway station is 21 km and it is 22 km away from New Delhi railway station.
 Holambi Kalan has been inhabited for over 400 years.
 Metro Vihar is a rehabilitated colony which is in Holambi Kalan.
 The population of Metro Vihar is 42,392 according to 2011 census.
 The area has developed considerably in the last 15 years, but still there are many civic problems concerning the area.
Clarkston (Scots: "Clairkstoun" , Scottish Gaelic: "Baile Chlarc" ) is a suburban town in East Renfrewshire, in the Central Lowlands of Scotland.
 It lies 4.7 mi east of Barrhead, 7.2 mi east-southeast of Paisley and 3.9 mi northwest of East Kilbride.
 A small dormitory town with a population of 14,944, Clarkston is on the southern fringe of the Greater Glasgow conurbation and directly adjoins the neighbouring suburbs of Busby, Giffnock and Stamperland.
Portrush (from Irish: "Port Rois" , meaning "promontory port" ) is a small seaside resort town in County Antrim, Northern Ireland, United Kingdom, on the County Londonderry border.
 The main part of the old town, including the railway station as well as most hotels, restaurants and bars, is built on a mile–long peninsula, Ramore Head, pointing north-northwest.
 It had a population of 6,454 people as measured by the 2011 Census.
 In the off-season, Portrush is a dormitory town for the nearby campus of the University of Ulster at Coleraine.
 It neighbours the resort of Portstewart.
Sanderstead is a village in the London Borough of Croydon, situated on high ground at the edge of the built-up area of Greater London.
 From 1915 to 1965 it formed a parish in the Coulsdon and Purley Urban District of Surrey.
 Having been a farming community in previous centuries, Sanderstead is now essentially a dormitory village for commuters to central London and Croydon.
 The Grade I listed All Saints' Church dates from the 13th century but was extensively altered in later periods.
 Sanderstead station is lower down the hill and has trains to East Croydon and central London, and to East Grinstead and Uckfield.
 Sanderstead was the place of origin of the Sanders surname.

Question: What is the suburban dormitory town 12 miles from central London that is served by the station named after Theobalds Park?
Answer: Waltham Cross