Corridor connection

A gangway connection (or, more loosely, a corridor connection) is a flexible connector fitted to the end of a railway coach, enabling passengers to move from one coach to another without danger of falling from the train.

Origins: Coaches in British and American railways

The London and North Western Railway (LNWR) was the first British railway to provide passengers with the means to move from one coach to another while the train was in motion. In 1869 the LNWR built a pair of saloons for the use of Queen Victoria; these had six-wheel underframes (the bogie coach did not appear in Britain until 1874), and the gangway was fitted to only one end of each coach. The Queen preferred to wait until the train had stopped before using the gangway.

In 1887, George M. Pullman introduced his patented vestibule cars. Older railroad cars had open platforms at their ends, which were used both for joining and leaving the train, but could also be used to step from one car to the next. This practice was dangerous, and so Pullman decided to enclose the platform to produce the vestibule. For passing between cars, there was a passageway in the form of a steel-framed rectangular diaphragm mounted on a buffing plate above the centre coupler. The vestibule prevented passengers from falling out, and protected passengers from the weather when passing between cars. In the event of an accident, the design also helped prevent cars from overriding each other, reducing the risk of telescoping. Pullman's vestibule cars were first used in 1887. Among the first to use them was the Pennsylvania Railroad on the ''Pennsylvania Limited'' service to Chicago.

The Great Northern Railway introduced the Gould-design gangway connection to Great Britain in 1889, when E.F. Howlden was Carriage and Wagon Superintendent.

In March 1892, the Great Western Railway (GWR) introduced a set of gangwayed coaches on their to Birkenhead service. Built to the design of William Dean, it was the first British side-corridor train to have gangway connections between all the coaches, although they were provided not to enable passengers to move around the train, but rather to allow the guard to reach any compartment quickly. Electric bells were provided so that he could be summoned. When the guard was not so required, he kept the communicating doors locked. Passengers could still use the side-corridor within the coach to reach the toilet.

The gangway connections of the early GWR corridor coaches were offset to one side. Some coaches intended for use at the ends of trains had the gangway connection fitted at one end only. The GWR introduced restaurant cars in 1896; gangway connections were fitted, but passengers wishing to use the restaurant car were expected to board it at the start of their journey, and remain there: the connections were still not for public use.

In May 1923, the GWR introduced some new coaches on their South Wales services; some of these coaches had British Standard gangway connections and screw couplers as used on many other GWR coaches; some had Pullman-type gangway connections and Laycock "buckeye" couplers; and there were some with one type at one end, and the other end having the other type. In 1925 the GWR started to use the "suspended" form of gangway connection instead of the "scissors" pattern. From 1938, GWR coaches which were expected to need coupling to LNER or SR coaches were fitted with gangway adaptors, to allow the dissimilar types to be connected.

From the beginning, the London, Midland and Scottish Railway used the British Standard type of gangway connector, with its "scissors" pattern as used by the GWR. Some coaches needed for LNER or SR lines were given gangway adaptors, so that they could safely couple to coaches fitted with the Pullman-type gangway.

On the formation of British Railways on 1 January 1948, operators decided to produce a new range of standard coaches, instead of perpetuating existing designs—but the new types had to be compatible with the old. Two of the pre-BR companies (the GWR and the London, Midland and Scottish Railway) favoured the British Standard gangway, whereas the other two (the London and North Eastern Railway and the Southern Railway) used the Pullman type. In the design of their new Mark 1 coaches, British Railways decided to standardise on the Pullman type in view of its resistance to telescoping.

These gangways consisted of a flat steel plate, having a large aperture for the passageway. At the bottom it was riveted to the buffing plate, whilst the top was supported on the coach end by two telescopic spring units. On the coach end was a wooden doorframe; this was connected to the faceplate by a flexible diaphragm made from plasticised asbestos. When two coaches were coupled, a curtain was used to cover the inside surfaces of the diaphragms and faceplates. The doorframe was fitted with a lockable door, of either sliding or hinged type, depending on the interior layout of that end of the coach.

Travelling post offices

Coaches built for travelling post office (TPO) services normally had their gangway connections offset to one side. There were two main reasons: there was a perceived security risk should these coaches be coupled to ordinary passenger-carrying coaches, the differing gangway positions minimising the risk of intrusion; and more space was available for sorting tables, the postal workers being able to walk in a straight line between vans without disturbing the sorters.

A disadvantage was that when a van was added to a TPO train, it might need to be turned around before it could be used. After the formation of British Railways, most new Mark 1 TPO vans were provided with centre gangways, though a batch intended to work with older vans were given offset gangways. These were altered to the standard arrangement in 1973. Until then, they had been the only BR Mark 1 gangwayed coaches not to have the Pullman gangway.

Locomotives (corridor tenders)

A corridor tender is a locomotive tender with a passageway to one side, allowing crew changes on the fly.

The London and North Eastern Railway (LNER) decided that from the start of their summer timetable on 1 May 1928, the ''Flying Scotsman'' service would run non-stop over the between and . The locomotives to be used were of that railway's class A1, and the schedule was for the journey to be completed in hours. This was too long to allow a single crew to handle the train without a rest; means were therefore sought by which the crew could be changed at approximately the half-way point.

The LNER's locomotive design team, headed by Nigel Gresley, produced a new design of tender that was slightly longer than the old, but built as high and wide as possible without compromising the loading gauge. A passageway was incorporated along the right-hand side, and at the rear end a Pullman type gangway connection was fitted, together with a buckeye coupler, both of which were compatible with LNER coaches. The gangway was of concertina pattern, and was pressed against the corresponding gangway on the leading coach by means of sprung pistons.

Although a normal gangway connection was used, the passageway through the tender was only high and wide, and the floor of the passage was above the bottom of the water tank, requiring two steps at both ends. The passageway was illuminated by a single circular window in the tender rear panel, placed high up and to the right of the corridor connection. Ten of these tenders were placed in service between April and September 1928, of which three were attached to new locomotives of Class A3; two were attached to existing Class A3 locomotives, and five attached to Class A1 locomotives. The design was patented by Gresley in August 1928.

In service, the relief crew travelled in the front coach of the train, and as the train approached the half-way point, they left their seats and made their way forward through the corridor tender to the locomotive cab. On their arrival, the previous crew then handed over the controls and went back to the seats in the train vacated by the relief crew.

Another corridor tender (Number 5484) was built in 1929 for use with the new Class W1 4-6-4 no. 10000; four more were built in 1935 with the first four locomotives of the new Class A4, and a final seven were built with the 1937 batch of Class A4 locomotives, making a total of 22. The original ten were reconditioned in 1936–1937 and attached to other Class A4 locomotives. In May 1948, the 1929-built corridor tender was transferred to a locomotive of Class A4, after which all 22 remained with this class until withdrawal.

Open gangways in urban transit

File:Skytrain Mk3 interior toward center.jpg, Interior view of the Vancouver SkyTrain Bombardier Innovia Metro 300 (Mark III)
File:METRO-AZUR-INTERIEUR.jpg, Interior view of Azur train MPM-10
File:Bombardier Flexity Outlook Gangway.jpg, Open gangway on a Bombardier Flexity Outlook tram
File:34th St Hudson Yards td 30 - R211 Open House.jpg , R211 mockup
File:SydneyMetro16.jpg, Interior of a Sydney Metro Alstom Metropolis TS set

In urban transit, open gangways are most commonly used in light rail and streetcars, where the railcars are divided into two or more sections linked by gangways. Articulated buses similarly have extensions connected with a gangway. Open gangways have also become increasingly used for heavy rail rapid transit rolling stock. It provides a way to seamlessly move between cars at any time, without passing through doors and a dangerous open area that is often against the rules. It also raises the capacity of metro cars by about 10%, a significant improvement for systems such as the New York City Subway where infrastructure and timetables are at capacity.

The NYC Subway was the first transit authority in the world to have a subway / metro system with an open gangways, with the BMT Multi-Section Articulated Cars (1925 - 1965), then operated by the Brooklyn–Manhattan Transit Corporation. Cars like these were not purchased again, as the cars needed constant repair, and crime was increasing in NYC at the time, resulting in locked doors between subway cars. RATP was the first European authority to order open gangway cars for Paris Metro, with Bombardier MF 88 and GEC Alsthom MP 89 (as NS 93 for Santiago Metro); it was followed by Metrovalencia FGV 3900, Madrid Metro AnsaldoBreda 7000 and CAF 8000, and Rome Metro MA-300 (CAF S/300).

In North America, the Toronto Transit Commission (TTC) was the second transit authority to use open gangway rolling stock, with its Toronto Rocket railcars (a variant of the Bombardier Movia line of open-gangway cars) delivered to the Toronto subway system from 2010. The Société de Transport de Montréal (STM) upgraded its fleet of subway cars with Azur ( MPM-10) trains that included open gangways. Montreal Metro took delivery of the Bombardier/Alstom MPM-10 Azur trains in 2016.

The Metropolitan Transportation Authority (MTA) is considering the design for the New York City Subway's R211 order under construction. Initially the order will consist of 545 cars, of which 20 will be in experimental open gangway formations. The order includes an option to purchase up to 640 additional open gangway cars, the decision of which will be based on the success of the prototype sets. While not technically an open gangway because of the use of doors, BART permits passengers to walk between cars via a more traditional gangway connection. This has been a feature since its opening in 1972.

The open gangway design has been incorporated into Alstom Metropolis, Bombardier Movia and Innovia Metro, Siemens Inspiro, and 81-760 Oka/81-765 Moskva trains which operate on a variety of subway systems around the world, such as Riyadh Metro (Inspiro, Innnovia, Metropolis); Singapore MRT (Metropolis, Movia); Barcelona Metro, Amsterdam Metro, Budapest Metro, Buenos Aires Underground, Sydney Metro (Metropolis); Vancouver SkyTrain (Innovia); London Underground (Inspiro New Tube for London, S Stock); Baku Metro (Oka, Moskva); and Tashkent Metro (Moskva).

Some trains, like U-Bahn BVG Class HK, S-Bahn DBAG Class 481, 81-740 Rusich etc. use open gangways only between car pairs or 3-car sets; recent versions of these trains, Class IK, Class 483 and 81-760 Oka/81-765 Moskva, employ full walkthrough gangway along entire train.

Multiple units (walk-through heads)

File:Jr 285 undocking Okayama 20130331.jpg, JR 285 series
File:Doorloopkop.jpg, Dutch ICM
File:AM96 - Gentbrugge.JPG, Belgian MS96
File:DSB IC3 Fred.JPG, Danish DSB IC3
File:N’EX ；The Narita Express.JPG, JR E259 series
File:JREast-E351-Coupling.JPG, JR E351 series
File:Series-E353 S110.jpg, JR E353 series
File:Northern Rail Class 150, 150268, Wigan Wallgate railway station (geograph 4531374).jpg, British Rail Class 150
File:Class 350 350240.jpg, British Rail Class 350
File:Burnham - GWR 387135+387148 Maidenhead service.JPG, British Rail Class 387

A walk-through head is a type of gangway connection that is installed in a train set that is intended to enable the passage from one train to the next when they are interconnected.

With most matched multiple-units, it is possible, as with locomotive towed carriages, to walk from one unit to another, but a passage between adjacent cabbed ends of coupled trains is less common.

See also

* Anticlimber
* Buffers and chain coupler
* Janney coupler
* Railway coupling
* SA3 coupler
* Tightlock coupler
* Vestibule
* Vestibuled train

Notes

References

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Rail technologies
Passenger rail rolling stock