Monorail
Single-rail transit system straddling or suspended from a beam.
A monorail is a type of urban rail transit where trains either ride on top of or hang from a single rail or beam. It usually offers a middle level of transport capacity—more than a tram but less than a heavy metro. While people often use the term for any elevated train or people mover, it specifically refers to the single-beam track design. There are two main kinds: straddle-beam monorails, where vehicles sit on top of a concrete or steel beam, and suspended monorails, where vehicles dangle below the guideway.
The word "monorail" may have come from German engineer Eugen Langen in 1897, who called his suspended system the "Eugen Langen One-railed Suspension Tramway." The Monorail Society defines it as a single rail that serves as a track for passenger or freight vehicles. Usually the rail is elevated, but monorails can also run at ground level, below ground, or in tunnels. Vehicles either hang from or straddle a narrow guideway, and they are wider than the beam that supports them.
Monorails are often elevated, which can cause confusion with other elevated systems like the Docklands Light Railway, Vancouver SkyTrain, or AirTrain JFK, which run on two rails. Monorail vehicles can look like light rail cars and may be staffed or driverless. They can be single rigid cars, articulated units, or coupled into trains. Like other advanced transit, monorails can use linear induction motors, and like conventional railways, their bodies connect to the beam via bogies to handle curves. Some cities, such as Mumbai and Bangkok, run monorails alongside conventional metro lines.
Unlike trams or light rail, modern monorails are always separated from traffic and pedestrians because of the rail's shape. They are both guided and supported by the same single beam, unlike rubber-tyred metros or guided buses. Monorails can also use pantographs. Because they are grade-separated, they avoid red lights, intersections, and traffic jams. Collisions are far less likely since only vehicles on the same system can hit each other. Passengers get sunlight and views, and monorails can be quieter than diesel buses and trains. They draw electricity from the track structure, not from a third rail or overhead wires. Compared to older elevated train systems, a monorail beam casts a narrower shadow.
On the downside, monorails can cost more than light rail that doesn't need tunnels. They must stay above ground or use larger tunnels than conventional rail, and they need complex track-switching equipment.
Under the Monorail Society's beam-width rule, some maglev systems—like the Transrapid and Linimo—count as monorails, though they don't physically touch the beam while moving.
The first monorail prototype was built in Russia in 1820 by Ivan Elmanov. Attempts to create monorail alternatives to standard railroads go back to the early 1800s. The Centennial Monorail appeared at the 1876 Philadelphia Exposition, and the Bradford and Foster Brook Railway, based on that design, ran from January 1878 to January 1879. Around 1879, Haddon and Stringfellow each proposed a "one-rail" system using an inverted V-shaped rail for military and civilian use. French engineer Charles Lartigue built a line based on a similar idea.
Modern straddle-beam monorails come from the ALWEG system of the 1950s, which dominates today's installations. Suspended systems still run on the Wuppertal Schwebebahn (opened 1901, the oldest operating monorail) and the Chiba Urban Monorail (the largest suspended network). Monorails are most often found in big cities, airports, and theme parks. Modern mass-transit monorails took off in the second half of the 20th century, especially in Japan, where Tokyo Monorail has carried over 1.5 billion passengers since 1964. China's Chongqing Rail Transit runs the world's largest and busiest monorail system; its Line 3 alone carries over 680,000 passengers daily. Monorails also serve airport shuttles, niche uses like agriculture and mining, and amusement parks. They have appeared widely in popular culture, from the 1966 film *Fahrenheit 451* to *The Simpsons* episode "Marge vs. the Monorail" (1993), which the Monorail Society says shaped negative public views of the technology.
- Largest suspended network
- Chiba Urban Monorail
- Largest and busiest system
- Chongqing Rail Transit, China
- Total passengers (Tokyo Monorail since 1
- Over 1.5 billion
Lore & Background
Monorails are a form of urban rail transit where trains either ride atop or are suspended beneath a single rail or beam. Their capacity typically falls between that of trams and heavy metro systems. Two principal designs exist: straddle-beam monorails, where vehicles sit on a concrete or steel beam, and suspended monorails, where vehicles hang below the guideway. The straddle-beam type, originating from the 1950s ALWEG system, dominates modern installations, while suspended systems remain in active service on the Wuppertal Schwebebahn, the oldest operating monorail, and the Chiba Urban Monorail, the largest suspended network. Monorails are most commonly found in large cities, airports, and theme parks. Early experiments date to the 1820s, with load-bearing systems emerging in the late 1800s. Modern mass-transit monorails developed mainly in the second half of the 20th century, particularly in Japan. The Tokyo Monorail has carried over 1.5 billion passengers since 1964, and Chongqing Rail Transit in China operates the world’s largest and busiest monorail system. Monorails are also used for airport shuttles, niche applications like agriculture and mining, and amusement parks. They have been depicted extensively in popular culture, including in the film *Fahrenheit 451* and *The Simpsons* episode “Marge vs. the Monorail.” The term “monorail” may have originated in 1897 from German engineer Eugen Langen. Monorails are always separated from other traffic, guided and supported by the same single beam, and can be powered by linear induction motors or pantographs. They avoid traffic jams and collisions with other road users, cast a narrower shadow than conventional elevated trains, and can be quieter than diesel buses. However, they can be more expensive than light rail without tunnels, require larger tunnels if built underground, and need complex switching equipment. Some maglev systems, such as Transrapid and Linimo, are considered monorails under the beam-width criterion, though they do not physically contact the beam while moving.
Reader's Guide
Monorails are used in airport shuttle services, niche applications including agriculture and mining, and amusement parks. They are often elevated, leading to confusion with other elevated systems. Monorails are always separated from other traffic and pedestrians due to the geometry of the rail. They can be quieter than diesel buses and trains and obtain electricity from the track structure. Conversely, monorails can be more expensive than light-rail systems that do not include tunnels, and they require complex track-switching equipment.
A Legacy in the Making: From 1971 to the Present
It marked Disney's second venture into monorail technology, following the earlier Disneyland system in California. The original fleet consisted of Mark IV trains serving two routes around the Magic Kingdom area: a Resort loop and an Express shuttle. The system grew steadily over the following decade. Since the Grand Floridian addition, no new stations or lines have been built, and Disney has indicated that future expansions are unlikely because of the enormous construction costs involved. Interestingly, a legal easement permitting monorail construction through the Saratoga Springs Resort & Spa has remained on the books since 1970, a dormant possibility that has never been realized.
Engineering the Network: Beams, Routes, and Switches
The Walt Disney World Monorail stretches across 14.7 miles of elevated track and operates three distinct services. The Magic Kingdom Resort line loops clockwise around the inner lagoon beam, stopping at five stations including the Magic Kingdom, the Contemporary, the Transportation and Ticket Center, the Polynesian, and the Grand Floridian. The Express line runs counter-clockwise along the outer exterior beam, offering non-stop travel between the Magic Kingdom and the Transportation and Ticket Center in the mornings. The Epcot line provides a single non-stop clockwise run between Epcot and the Transportation and Ticket Center. The physical infrastructure is notable: the beams are constructed from steel-reinforced concrete with a polystyrene core to reduce weight, and they were originally shipped by train from Washington state. Four track switches and two spur tracks connect the various beams to a maintenance shop, while the outer Express beam doubles as the primary route for moving trains in and out of service.
The Mark VI Fleet: Power, Speed, and Safety
A towing knuckle at each end allows a diesel tractor to push or pull a train if needed. Maximum operating speed is capped at 40 miles per hour, with restricted zones dropping to 15 miles per hour, all enforced by an onboard computer that triggers an automatic overspeed stop if limits are breached. Train spacing is governed by the MAPO moving-block system, which maintains a 500-foot minimum gap; any closer approach triggers immediate braking and is classified as a serious operational offense known as an overrun.
Riding the World's Busiest: Scale and the Road to Automation
This remarkable throughput was achieved with just twelve trains across three lines, underscoring the system's efficiency. In June 2014, Disney initiated a major automation overhaul, shifting to a new timetable to accommodate the work. The stated goals included more frequent dispatch, faster switching between beams, enhanced safety, and real-time arrival information for waiting guests. Under the new arrangement, platform attendants operate a control panel to dispatch and manage the trains, while pilots remain seated in the front cab solely to intervene in emergencies. The transition marked a significant step toward a more streamlined and technologically advanced operation while preserving the human oversight that Disney deemed essential.
Frequently Asked Questions
What exactly is a monorail?
A monorail is an urban rail transit system whose trains travel along a single rail or beam rather than a pair of parallel tracks. It sits in the middle of the capacity spectrum, handling more riders than light trams but fewer than full heavy-metro lines.
What are the two principal monorail types and how do they differ?
Straddle-beam monorails have vehicles that ride on top of a concrete or steel beam, while suspended monorails hang their cars beneath the guideway. Both share the single-beam track structure that distinguishes true monorails from other elevated rail.
Which is the largest and busiest monorail system in the world?
Chongqing Rail Transit in China holds that title, serving as the biggest and highest-riding monorail network globally. Its scale far exceeds other single-beam systems in both route length and daily passenger volume.
What is the largest suspended monorail network?
The Chiba Urban Monorail in Japan is the biggest suspended-type system in operation. Its cars hang below the beam, making it the most extensive example of the suspended monorail design.
Why do people sometimes call any elevated train a 'monorail' when that's technically wrong?
The term has become a colloquial catch-all for any elevated rail line or people mover, regardless of track structure. Strictly speaking, though, a true monorail must run on or hang from a single beam, not on conventional dual rails.
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