Question:  Runcorn signal box is located at the south end of the station managed by which company?

Context paragraphs:
Habrough railway station: Habrough railway station serves the village of Habrough and the town of Immingham in North East Lincolnshire, England.  It was built by the Great Grimsby and Sheffield Junction Railway in 1848.  Up until 1988 there was a signal box at the station on the south side of the track and east side of the road with manually-operated gates.  It was of typical Great Central Railway signal box design.  The main buildings were located on the eastbound platform and were linked to the westbound one via a footbridge, but both have also been demolished and the crossing is now automatic.

Talerddig railway station: Talerddig railway station was a station in Talerddig, Powys, Wales.  The station opened in 1900 and closed on 14 June 1965, one of many on the line abandoned as a result of the Beeching Axe.  The signal box predated the station, being built by McKenzie and Holland in 1874.  The station building and signal box now form part of a private residence.  There is still a much used passing loop on the Cambrian Line here, though this is now supervised from the signalling centre at and the points work automatically.

Lostwithiel signal box: Lostwithiel signal box is a Grade II listed former Great Western Railway signal box, located on Lostwithiel railway station in Cornwall, England.  The signal box is situated at the northern end of Platform 1, adjacent to the level crossing.

Crewe North Junction signal box: Crewe North Junction signal box is signal box with a Westinghouse All Electric Style 'L' lever frame which was commissioned, along with Crewe South Junction signal box (which also had a Westinghouse Style 'L' frame), on 29 March 1940 as part of a resignalling project at Crewe railway station.  It saw continued use until 19 July 1985 when it was decommissioned for a redesign of Crewe station and its track layout and signalling.

Runcorn railway station: Runcorn railway station is in the town of Runcorn in Cheshire, north-west England.  The station lies on the Liverpool branch of the West Coast Main Line between Weaver Junction and Liverpool South Parkway and is managed by Virgin Trains.

Runcorn signal box: Runcorn signal box is a railway control building sited at the south end of Runcorn railway station in Cheshire, England.  It is located to the west of the West Coast Main Line and the branch line to Folly Lane.  The signal box is recorded in the National Heritage List for England as a designated Grade II listed building.  It was built by the London, Midland and Scottish Railway (LMS) in the early years of the Second World War incorporating the specifications of the Air Raid Precautions (ARP), and was one of the first of such signal boxes to be operational.

Llanelli railway station: Llanelli railway station is the railway station serving the town of Llanelli, Carmarthenshire, Wales.  It is located on the West Wales Line and the Heart of Wales Line 11+1/4 mi west of by rail.  The station, and the majority of trains calling at it, are operated by Arriva Trains Wales.  It is located between two Level Crossings (known as East and West) that were previously upgraded in the 1970s.  More recently (2015) Network Rail has carried out a further upgrade which saw the control of these level crossings pass from the Grade-II listed Llanelli West signal box (which worked the two crossings here only since 1973) to Port Talbot Panel Signal Box using CCTV.

Scrooby railway station: Scrooby was a railway station on the Great Northern Railway running between Retford and Doncaster.  The station served the small village of Scrooby until closed in 1931, though an excursion stopped in 1938.  Sunday trains ended in 1924.  In 1897 it had a booking office, waiting room, stationmaster's house, signal box and 5 passenger trains a day each way, but no goods facilities.  About 1978 the signal box was replaced by Doncaster power box.

Civic railway station: Civic railway station was located on the Newcastle line in New South Wales, Australia.  It served the Civic part of Newcastle's central business district, opening on 22 December 1935.  The station had the smallest signal box in the state to control the Merewether Street level crossing.  The signal box closed in July 1992.  Civic station closed on 25 December 2014, when the Newcastle line was truncated to terminate at Hamilton.

Buckden railway station: Buckden railway station was a station in Buckden, Cambridgeshire.  The station and its line closed in year 1959.  The signal box is now preserved and in use as Tunbridge Wells West signal box on the Spa Valley Railway.

Supporting paragraphs: Runcorn signal box Runcorn railway station
Answer: Virgin Trains