Question: Who produced Brilliant and owns significant collections of both historic and commercial railway locomotives and rolling stock?

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Dual coupling: Different types of railroad rolling stock have different couplers depending on the purpose and type of equipment being used and its intended destination.  European rolling stock tend to use buffers and chain couplers while American rolling stock uses a Janney coupler or "knuckle coupler".  These are incompatible with each other, but where some railroads have obtained older, less expensive used rolling stock from different countries or regions, instead of having to standardize on one form of coupler, it may be useful to be able to use either type of coupler on a piece of rolling stock without having to remove anything.

Canberra Railway Museum: Canberra Railway Museum was run by the ACT division of the Australian Railway Historical Society (ARHS).  The museum housed displays of historic locomotives, passenger cars, freight vehicles, track machinery and railway memorabilia.  The museum precinct also served as a base for the society's rail operations.  The Society preserved railway history, particularly that of Canberra and the southern districts of New South Wales, for the enjoyment and enlightenment of present and future generations.  Members worked toward this goal by collecting and restoring locomotives, other rolling stock and items of railway memorabilia; preserving and recording railway history; and operating trains with restored rolling stock.

Officine Ferroviarie Meridionali: Officine Ferroviarie Meridionali or OFM was an Italian railway and rolling stock manufacturing company based at Naples.  In 1915, Ing Nicola Romeo and Co Ltd owned by Nicola Romeo bought Officine Ferroviarie Meridionali and two other factories producing railway locomotives and other rolling stock (one was in Rome and another one in Saronno) to support his automobile activities and his dream about aviation and airplanes.

Porterbrook: Porterbrook is one of the three major rolling stock operating companies (ROSCO) in the United Kingdom (the other two being Angel Trains and Eversholt Rail Group).  It owns around a third of passenger railway locomotives, multiple units and coaching stock running on Network Rail's system which it leases to various train operators.

Eversholt Rail Group: Eversholt Rail Group (formerly HSBC Rail (UK) Limited) is one of the three major ROSCOs (rolling stock operating company) in the United Kingdom.  Created in 1994 as part of the privatisation of British Rail, it owns around a third of passenger railway locomotives, multiple units and coaching stock running on Network Rail's system which it leases to various train operators.

SteamRail Wanganui: SteamRail Wanganui is a railway preservation society based in Wanganui, New Zealand.  It owns heritage railway locomotives, rolling stock, and structures in the Wanganui area.  It also operates occasional excursions in conjunction with other societies and provides a base for excursions passing through Wanganui to stop and visit while replenishing supplies.  Its goal is to establish a railway precinct in Wanganui as a historical and tourist attraction.

Brilliant (band): Brilliant were a British pop/rock group active in the 1980s.  Although not commercially successful and mauled by the critics, they remain notable because of the personnel involved - Martin Glover a.k.a. Youth, formerly of Killing Joke and subsequently a top producer/remixer; Jimmy Cauty, later to find fame and fortune as one half of The KLF; and (prior to the band signing with WEA) Ben Watkins a.k.a. Juno Reactor.  Equally notable was their management (David Balfe), their record company A&R manager (Bill Drummond, the other member of The KLF), and songwriting and production team (Mike Stock, Matt Aitken and Pete Waterman known as Stock Aitken Waterman).

Derby Works: The Derby railway works comprised a number of British manufacturing facilities designing and building locomotives and rolling stock in Derby, England.  The first of these was a group of three maintenance sheds opened around 1840 behind Derby station.  This developed into a manufacturing facility called the Midland Railway Locomotive Works, known locally as "the loco" and in 1873 manufacturing was split into locomotive and rolling stock manufacture, with rolling stock work transferred to a new facility, Derby Carriage & Wagon Works.

Pete Waterman: Peter Alan "Pete" Waterman, OBE (born 15 January 1947) is an English record producer, songwriter, radio and club DJ, television presenter, president of Coventry Bears rugby league club and a keen railway enthusiast.  As a member of the Stock Aitken Waterman songwriting team he wrote and produced many hit singles.  He is the owner of significant collections of both historic and commercial railway locomotives and rolling stock.

Walkers Limited: Walkers Limited was an Australian engineering company, based in Maryborough, Queensland.  It built ships and railway locomotives.  The Walkers factory still produces railway locomotives and rolling stock as part of Downer Rail.

Supporting paragraphs: Brilliant (band) Pete Waterman
Answer: Pete Waterman