4D

4D or 4-D may refer to:

In entertainment:

4 (New York City Subway service)

The 4 Lexington Avenue Express is a rapid transit service in the A Division of the New York City Subway. Its route emblem, or "bullet", is colored apple green since it uses the IRT Lexington Avenue Line in Manhattan. The 4 operates between Woodlawn in the Bronx and Utica Avenue in Crown Heights, Brooklyn via Jerome Avenue Local in the Bronx and Eastern Parkway Express in Brooklyn at all times except nights. During nights, the 4 serves all stops except Hoyt Street and is extended to/from New Lots Avenue in East New York, Brooklyn via Livonia Avenue as a replacement of the 3. Limited rush hour service originates and terminates at New Lots Avenue. During rush hours, the 4 skips 138th Street – Grand Concourse in the peak direction, with some northbound trains running express north of 167th Street and short turning at Burnside Avenue.

Service history

During the extension of the IRT Lexington Avenue Line north of 42nd Street – Grand Central Terminal, shuttle elevated trains served the IRT Jerome Avenue Line (which at the time was only between East 149th Street – Grand Concourse and Kingsbridge Road) starting June 2, 1917. On April 15, 1918, shuttles were extended to Woodlawn. A second shuttle, using subway cars, from 149th Street - Grand Concourse to Grand Central started on July 17, 1918.

4D Train

The 4D was a prototype double deck electric multiple unit built for the Public Transport Corporation, Victoria, for operation on the Melbourne railway system. It remains the only double deck train ever to have run in Melbourne.

Design

Built by A Goninan & Co, Broadmeadow it was delivered by rail in December 1991.

The train's design was based on the Tangara train being built by A Goninan & Co for CityRail in Sydney, however it was similar only in terms of interior and exterior bodywork; the train's electrical system was much closer to that of the Comeng sets. The design was further modified for use on Melbourne's broad gauge track, and its control system was designed specifically to allow in-service coupling and operation with Comeng sets.

It was manufactured from stainless steel, fitted with air-conditioning, tinted windows, and inter-car doors allowing passengers to access all carriages of the train. It had a total passenger capacity of 974 passengers: 346 seated and 628 standing.

As part of the trial, the Belgrave and Lilydale lines were selected as main testing grounds for the unit and necessary works were performed to accommodate the train's somewhat unconventional dimensions. It was known that the train was physically too large for the Jolimont tunnel between Jolimont and West Richmond railway stations on the Hurstbridge and Epping lines. Given that the train was a demonstrator, it was likely that production designs or future infrastructure plans would have dealt with this.