The New South Wales V sets are a class of electric multiple units (EMU) currently operated by Sydney Trains on its intercity routes.

Built by Comeng between 1970 and 1989, the sets are of stainless steel construction, and are currently the oldest in the electric fleet of NSW.

In July 1968, the Department of Railways New South Wales placed an order for the first batch 16 cars with Commonwealth Engineering.

[4] These cars had many similar features to the later-built cars, including the one-piece moulded glass reinforced plastic end in royal blue & grey livery (earning them the Blue Goose nickname), semi-automatic doors, electronically controlled brakes and double-glazed windows.

The cars were fitted with AEI electrical equipments, using similar traction motors to the 1955 electric single deck train stock (U sets and New South Wales Sputnik suburban carriage stock) but with a then brand new "Camshaft controller", for controlling power to the traction motors.

The electrical equipments was split between the power and trailer car, the motor-alternator suffered from numerous failures, preventing the air-conditioning system and the air brake comporessors from working.

This led to the refurbishment of the DDIU sets with the original luggage racks above the seating in the single deck section being removed.

Between March and December 1982 the cars were rewired at Electric Carriage Workshops, and the driver compartments removed and replaced by passenger toilets and luggage space.

[2] The cars were subsequently renumbered: In 2005, these sets were withdrawn and scrapped following the discovery of rust in the steel frames.

The electrical equipment was all mounted on the power car, using Mitsubishi Electric equipment; they had stainless steel underframes; were fitted with vacuum retention toilets, and had gold as opposed to green tinted windows.

[6] It wasn't a success, not helped by poor marketing, and it was rebuilt as a conventional trailer (without controls) in 2000 and renumbered DET 9216.

During the Citydecker refurbishment carried out by A Goninan & Co in the 1990s, DCT 9031-9036 had their driver controls reinstated and were recoded as DTDs allowing CityRail to introduce The River, a two-car service from Wyong to St Marys.

The DCMs that had destination indicators eventually had them removed and replaced with a metal blanking plate, after a decision not to use them on Interurban services.

DIM 8069-8092 were built with a white moulded fibreglass end incorporating the State Rail Authority's corporate colours of red, orange and yellow, yellow interiors, newer air conditioning technology and ditchlights.

Technological advances saw a thyristor chopper system fitted to the next batch of power cars, coded DJM.

DJM 8101 had its Candy livery moulded fibreglass end repainted into CityRail blue and yellow in 1990 to form a special set, with the commemorative wording "celebrating 20 years of double-deck intercity services to Gosford" applied near the driver's cab window.

There were several changes: the cars were finished in corrugated steel, instead of the previous inserted Budd fluting.

[9] Starting in May 1995 the earlier carriages were overhauled by A Goninan & Co, Broadmeadow as part of the CityDecker program.

This saw the DCMs receive driver's cab air conditioning, destination indicators and ditchlights where not already fitted.

On 1 July 2013, a refurbishment of the remaining 200 cars was announced as part of the NSW TrainLink and Sydney Trains restructure and branding.

The external livery of the trains are also changed to a grey, red and yellow scheme, featuring the NSW TrainLink logo.

Following the extension of the electrified network, their sphere of operation was extended to Wyong (April 1982), Newcastle (June 1984), Port Kembla (February 1986), Dapto (January 1993) and Kiama (November 2001).

In May 1987, the State Rail Authority introduced a new timetable that required V sets to operate at the higher XPT speeds (up to 130 km/h).

This practice was subsequently approved "on a continuing trial basis" in June 1990 as testing by State Rail Authority engineers proved it was satisfactory.

[citation needed] The remaining 15 original series cars were withdrawn in late 2005 due to corrosion in the underframes, these cars had mild steel underframes and stainless steel bodies and the contact between these 2 dissimilar metals resulted in galvanic corrosion.

It was then used to test features such as door indicator lights which were eventually rolled out to the rest of the V set fleet.

[20][21] They were fitted with computers and test equipment, several CCTV cameras and small kitchens in the trailer cars.