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Articulated buses use a joint between two sections to carry more passengers without making a single rigid vehicle impractically long or tall. Designs vary: many use a pivoting connection and a rear axle that follows the turn, while some rear-engine models steer the rear wheels to control the bus’s path. The source report describes these engineering principles and historical examples, but does not announce a new design or provide a technical comparison of current models.
Articulated buses carry more passengers by joining two vehicle sections at a pivoting connection, but the way they turn depends on their wheel layout and steering design. A report by The Autopian, prompted by questions about a preserved 1987 MAN articulated trolley bus, describes how some buses rely on a conventional joint while other designs use rear-wheel steering to guide the back section through a turn.
The basic design addresses a practical limit: a single rigid bus becomes harder to maneuver as it grows longer, while a double-decker may not fit under overhead infrastructure or through tunnels. Dividing the vehicle into sections adds passenger space without adding another level. An articulating joint connects the front and rear portions, and a flexible, accordion-like enclosure covers the passage between them.
The report distinguishes this arrangement from a bus towing a passenger trailer. In a trailer bus, the passenger section is not joined to the main vehicle through an interior passage and may have its own doors. An articulated bus, by contrast, lets passengers move between its connected sections while the joint accommodates movement as the vehicle turns or travels over uneven ground.
Not every early design bent in the same way. The report cites the 1937 Alfa Romeo 110 AM-Macchi and Baltimore’s 1938 Twin Coach Super-Twin as early examples that articulated vertically but used rear-wheel steering for turns. The Twin Coach’s maker said this approach kept the floor straight from front to rear. The report also points to King County Metro No. 4020, a 1987 MAN SG-T310 articulated trolley bus, as an example visitors can ride at the Illinois Railway Museum’s Bus Day event.
How the Joint Shapes City Travel
The engineering matters because vehicle length is a trade-off: more capacity can reduce the need to run several smaller buses, but a long rigid vehicle may be difficult to route through tight streets. Articulation gives transit agencies a way to add passenger space while retaining a vehicle that can bend around corners.
How the rear section follows the front affects the bus’s path through a turn. Rear-wheel steering, used in some early designs described by The Autopian, is one solution; other articulated buses use different layouts. The report’s examples show that “bendy bus” is not a single mechanical formula. For passengers, the visible accordion is only part of the system: the joint and wheel arrangement determine how the sections move in relation to one another.
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From Early Buses to the Modern Joint
The report traces articulated buses to the early decades of motor-bus development, when operators sought ways to carry more people in one vehicle. It identifies a Dutch Ford Model T from the early 1920s as an early articulated example, with a rear section connected by an accordion-like center. The source describes this as the earliest example its author could find, not as a definitive record of the first articulated bus.
Other experiments followed. The report says the Alfa Romeo 110 AM-Macchi used vertical articulation and rear-wheel steering, and that Baltimore put the Twin Coach Super-Twin into service in 1938. The Illinois Railway Museum, which the source describes as holding a large collection of preserved buses, provides a setting where visitors can see and ride historic examples. Its annual Bus Day prompted readers to ask how articulated buses work.
“A lot of these buses put brilliant engineering in plain sight.”
— The Autopian report
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Design Details Still Unspecified
The supplied report excerpt does not give detailed diagrams, dimensions or a full account of how a contemporary rear-engine articulated bus transmits power and controls movement through its joint. It also does not compare the turning behavior of current models or establish which design is most common. The Dutch Ford is presented as the earliest example the author could find, rather than a verified first. Those limits mean the historical examples explain the range of approaches but do not establish a complete history or a universal design rule.
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More Examples Could Clarify the Mechanics
The source material describes a report rather than a newly announced bus, policy or engineering change, so it identifies no scheduled industry milestone. Further technical detail would be needed to explain how a particular modern model handles steering, power delivery and forces at the joint. The museum’s Bus Day offers visitors a chance to experience preserved buses, including the 1987 MAN trolley bus cited in the report, but the source does not specify the next event date.
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Key Questions
What makes an articulated bus different from a bus towing a trailer?
An articulated bus has connected sections joined by a flexible joint, generally allowing passengers to pass between them. A towed passenger trailer is a separate unit and may have its own doors, as described in The Autopian report.
How does an articulated bus bend?
A joint between the front and rear sections permits them to change angle as the vehicle moves. The precise movement and the way the bus turns depend on its design; the source describes early examples with vertical articulation and rear-wheel steering.
Why not make one rigid bus longer?
The report says very long rigid buses can be harder to maneuver on city streets. Articulation offers another way to add passenger capacity without increasing vehicle height.
Did all early articulated buses use the same design?
No. The report describes early buses with different approaches, including vertical-only articulation and rear-wheel steering. It does not provide a full technical survey of later or current models.
Source: hn
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