Transportation

Railway retarder: computer-controlled braking systems for freight classification yards Retarder Overview of computer-controlled railway retarders used in freight classification yards: how automated brake assemblies, sensors, and control logic regulate car speed for safe, effi…

Reykjavík–Keflavík Airport (Keflavik International Airport) Reykjavík-Keflavík Airport Iceland's principal international airport, located near Keflavík about 50 km west of Reykjavík, serving as the nation’s main overseas gateway and operated by the state company Isav…

Rhaetian Railway (RhB): Switzerland’s scenic metre‑gauge network Rhaetian Railway The Rhaetian Railway (RhB) is a Swiss metre‑gauge railway company based in Chur, operating an extensive electrified network across Graubünden, famed for the Albula and Bernina rout…

Richmond railway station, Melbourne Major suburban junction in Richmond, Melbourne. Ten platforms on a bridge over Punt Road serving eastern and south‑eastern lines; busy during sporting events and linked to trams an…

Rickshaw: human-powered and motorized passenger vehicles Rickshaw A rickshaw is a lightweight passenger vehicle originally pulled by a person. Variants include bicycle-drawn and motorized models; they remain common in parts of Asia and are used f…

Rigging (sailing): ropes, wires and systems for supporting and controlling sails Rigging Rigging is the system of ropes, wires and chains that support a vessel's masts and control its sails. It includes standing and running rigging, materials, common rig types and main…

RMS Carpathia: Cunard passenger ship famed for rescuing Titanic survivors RMS Carpathia Early 20th-century Cunard passenger steamship, launched 1903; renowned for rescuing Titanic survivors in 1912, later served in WWI and was sunk by a German U-boat in 1918.

RMS Lusitania British Cunard ocean liner launched in 1907, torpedoed and sunk by a German U-boat in 1915; its loss and disputed cargo influenced public opinion during World War I.

RMS Queen Mary Retired British ocean liner launched in the 1930s; served as a North Atlantic passenger ship and WWII troop transport. Since 1967 permanently moored at Long Beach as a museum, hote…

RMS Titanic British ocean liner RMS Titanic sank on her 1912 maiden voyage after striking an iceberg; the disaster cost over 1,500 lives and prompted major international maritime safety reform…

Road (transport infrastructure) Road A road is a prepared route across land for people and vehicles. This article explains types, materials, history, management, uses, and differences from waterways and railways.

Road number (route numbering) Road number A road number identifies a segment of public roadway within a numbering system. This article explains what road numbers are, how they are assigned, their history, uses, and common…

Road traffic safety Road traffic safety covers policies, infrastructure, vehicle standards and behaviour aimed at preventing collisions, injuries and deaths among motorists, cyclists and pedestrians.

Rochester railway station — rail hub in Rochester, Kent Rochester railway station Rochester railway station in Rochester, Kent, serves the Chatham Main Line and provides commuter and regional links between Medway, central London and coastal Kent towns.

Rochor MRT station (DT13) — Downtown Line station in Rochor, Singapore Rochor MRT station Underground Downtown Line station (DT13) serving the Rochor area near Sim Lim Square, LASALLE College of the Arts and Tekka Centre. Opened in 2015; includes a reserved basement for…

Rockcrawling: Technical Off‑Road Driving Over Natural Obstacles Rockcrawling Rockcrawling is a low‑speed, technical form of off‑road driving in which modified four‑wheel‑drive vehicles overcome large rocks and challenging terrain using precise control, gear…

Rocket: Principles, History, Types, and Uses Rocket Comprehensive overview of rockets: how they work, major types and fuels, historical development from early gunpowder devices to modern launch vehicles, and common applications.

Roeselare railway station (Belgium) Roeselare station Railway station in Roeselare, West Flanders, on the Bruges–Kortrijk corridor. A regional transport hub that was formerly the terminus for now‑closed lines to Ypres and Menen and th…

Roll cage (vehicle safety frame) Roll cage A reinforced frame built inside or around a vehicle to protect occupants in rollovers and severe impacts; common in motorsport and off-road use and also used to stiffen chassis.

Roller coaster: design, history, and how they work Roller coaster Comprehensive overview of roller coasters: structure, physics, common types, history, operation and safety. Explains components, energy principles, variations and why they thrill r…

Rolling stock: overview, types, design, history and uses Rolling stock Vehicles that run on railways, including powered and unpowered units. Covers common types, key components, historical development, practical uses and regulation.

Roman roads in Britain Paved trunk roads built by the Romans across Britannia (c.43–410 AD). Their design, routes and remains shaped transport, military control and later road networks in Britain.

Romford railway station: transport interchange in Havering, Greater London Romford railway station Major Greater London rail interchange on the Great Eastern Main Line, served by suburban, regional and Overground trains and integrated with local buses and town centre facilities.

Romford–Upminster line Short suburban railway branch in Greater London linking Romford and Upminster via Emerson Park. Single-track electrified line with frequent short workings operated by London Overgr…

Roosevelt Island Bridge A vertical lift bridge connecting Roosevelt Island to Astoria across the East Channel of the East River; primary route for vehicles and pedestrians besides public transit.

Roundabout: design, operation, history and road safety Roundabout An overview of roundabouts: their design elements, how they operate in different countries, types, history, safety benefits, and practical considerations for drivers, cyclists and…

Route Availability (RA) — British railway infrastructure grading Route availability Route Availability (RA) is the UK system that grades track and structures by the axle load and spacing they can carry. It guides where locomotives and rolling stock may run and how…

Roxas Boulevard — Manila's waterfront avenue and sunset promenade Roxas Boulevard Prominent waterfront boulevard in Manila along Manila Bay, celebrated for its coconut-lined promenade, sunsets, hotels, parks, and historical role in the city's waterfront planning…

Royal Albert DLR station Elevated Docklands Light Railway station serving the north quay of Royal Albert Dock in East London. Located on the Beckton branch in Travelcard Zone 3, near London City Airport an…

Royal Mail Ship (RMS): designation for British mail‑carrying vessels Royal Mail Ship RMS is the historic ship prefix for vessels contracted to carry mail for the British Royal Mail. It denotes a formal postal role, once common on passenger and cargo liners, and rem…

Royal Victoria DLR station Docklands Light Railway station in East London serving Royal Victoria Dock; opened 28 March 1994 on the Beckton branch, in Travelcard Zone 3. Key local transport link in the Dockla…

Rugby railway station Major interchange station in Rugby, Warwickshire on the West Coast Main Line, serving regional and long-distance trains between the West Midlands, the North West and London.

Rumbia LRT Station (SE2) — Sengkang LRT Line, Singapore Rumbia LRT Station Rumbia LRT Station (SE2) is a light rail stop on the east loop of the Sengkang LRT in Sengkang, Singapore. Opened in 2003, it serves nearby residential areas as part of the town's…

Runway (airport surface for aircraft takeoff and landing) Runway A runway is a prepared strip at an airport where aircraft take off and land. This article covers surfaces, layout, markings, lighting, operations, safety features, numbering and co…

Rush hour (peak traffic and public-transport congestion) Rush hour Periods during the day when road traffic and public-transport passenger loads are highest, typically correlated with commuting patterns and urban activity cycles.

Ruwer-Hochwald-Radweg — cycling route between Trier and Hermeskeil Ruwer-Hochwald-Radweg A 48 km recreational cycle path in Rhineland-Palatinate, Germany, linking the Moselle valley at Trier with the wooded Hunsrück near Hermeskeil. Suitable for day trips, family rides…

Ryōgoku Bridge (Ryōgoku-bashi) Ryōgoku Bridge Historical bridge across Tokyo's Sumida River that linked Musashi and Shimōsa in the Edo period; an enduring landmark in art, transport, and urban development of Edo/Tokyo.

S-train (Copenhagen S-tog): suburban rapid transit of Copenhagen S-train The S-train (S-tog) is Copenhagen’s suburban rapid transit network, linking the city centre to surrounding municipalities with frequent electric trains on a dedicated 170 km networ…

Saab 9-3 (compact executive car) Saab 9-3 The Saab 9-3 is a compact executive car introduced in 1998 as the successor to the Saab 900. It was offered in sedan, convertible and estate forms with turbocharged engines and spo…

Saab 900 The Saab 900 was a compact executive car produced by Saab from 1978 to 1998, noted for its distinctive aerodynamics, turbocharged engines, cockpit-like interior and a devoted enthu…

Sail: fabric surfaces that harness wind to propel vessels Sail A sail is a fabric surface mounted on spars that captures wind to move watercraft. This article covers sail parts, common types and rigs, basic aerodynamics, history, uses, and car…

Sailboat: design, parts, history, types and uses Sailboat An accessible guide to sailboats covering definition, main components, common rig types, history, uses and distinctions between dinghies, keelboats, multihulls and yachts.

Sailing: craft, history, techniques and modern uses Sailing Sailing is the art and practice of moving a vessel using wind power. This article explains basic principles, main parts of a sailing craft, historical development, contemporary use…

Sailing ship: design, history, and modern roles Sailing ship Large wind‑powered vessel typically with multiple masts and complex rigging; central to maritime trade, exploration and warfare from the Age of Sail and now preserved for training,…

Saint Petersburg Metro Rapid transit system serving Saint Petersburg and Leningrad Oblast, Russia. Opened in 1955; five lines, 67 stations, noted for deep tunnels, ornate stations and about 2–3 million d…

Sakuragichō Station Rail and subway interchange in Naka-ku, Yokohama serving JR East and the Yokohama Municipal Subway. Gateway to Minato Mirai with long-standing links to Yokohama's railway history.

San Diego–Coronado Bridge A curved vehicular bridge across San Diego Bay, opened in 1969, linking downtown San Diego and the city of Coronado; notable for its long span, visual profile and role as a major c…

San Francisco Municipal Railway (Muni): Overview, Services, and History San Francisco Municipal Railway Public transit system of San Francisco, operating buses, trolleybuses, cable cars, light rail and historic streetcars; part of the city's transportation network and linked with reg…