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- Trailing_wheel abstract "On a steam locomotive, a trailing wheel or trailing axle is generally an unpowered wheel or axle (wheelset) located behind the driving wheels. The axle of the trailing wheels was usually located on a trailing truck. On some large locomotives, a booster engine was mounted on the trailing truck to provide extra tractive effort when starting a heavy train and at low speeds on gradients.Trailing wheels were used in some early locomotives but fell out of favor for a timeduring the latter 19th century. As demand for more powerful locomotives increased, trailing wheels began to be used to support the crew cab and rear firebox area.Trailing wheels first appeared on American locomotives between 1890 and 1895, but their axle worked in rigid pedestals. It enabled boilers to be lowered, since the top of the main frames was dropped down behind the driving wheels and under the firebox. The firebox could also be longer and wider, increasing the heating surface area and steam generation capacity of the boiler, and therefore its power. The concept was soon improved to provide radial lateral movement by placing the pair of trailing wheels and their axle in a fabricated sub-frame or truck, usually with outside bearings as they gave the best lateral riding stability. One-piece cast-steel trailer trucks were developed about 1915, to provide the additional strength for a booster engine to be fitted to the trailing axle. Finally, about 1921 the Delta trailing truck was developed with an inverted-rocker centering device at the rear ends of the truck frame. Delta trucks were soon enlarged to carry four trailing wheels, and later six.In the Whyte notation, trailing wheels are designated by the last numbers in the series. For example, the 2-8-2 Mikado type locomotive had two leading wheels, eight driving wheels, and two trailing wheels. Some locomotives such as the 4-4-0 American type had no trailing wheels and were designated with a zero in the final place.In the Whyte notation the number designates the number of wheels rather than the number of axles, thus the final 2 in the Mikado's 2-8-2 refers to two wheels (one axle) while the Northern type's 4-8-4 designation refers to four wheels (two axles). The highest number of trailing wheels on a single locomotive is six as seen on 2-6-6-6 Allegheny type and the Pennsylvania Railroad's 6-8-6 steam turbine and 6-4-4-6 duplex locomotives, as well as numerous Mason Bogie locomotives.In the UIC classification system, the number of axles rather than the number of wheels is counted.".
- Trailing_wheel thumbnail 462trailing.jpg?width=300.
- Trailing_wheel wikiPageID "1644457".
- Trailing_wheel wikiPageRevisionID "570552251".
- Trailing_wheel hasPhotoCollection Trailing_wheel.
- Trailing_wheel subject Category:Train_wheels.
- Trailing_wheel type Artifact100021939.
- Trailing_wheel type Device103183080.
- Trailing_wheel type Instrumentality103575240.
- Trailing_wheel type Machine103700963.
- Trailing_wheel type MechanicalDevice103736970.
- Trailing_wheel type Mechanism103738472.
- Trailing_wheel type Object100002684.
- Trailing_wheel type PhysicalEntity100001930.
- Trailing_wheel type Wheel104574999.
- Trailing_wheel type Wheels.
- Trailing_wheel type Whole100003553.
- Trailing_wheel comment "On a steam locomotive, a trailing wheel or trailing axle is generally an unpowered wheel or axle (wheelset) located behind the driving wheels. The axle of the trailing wheels was usually located on a trailing truck.".
- Trailing_wheel label "Koła toczne".
- Trailing_wheel label "Laufradsatz".
- Trailing_wheel label "Trailing wheel".
- Trailing_wheel label "Поддерживающие колёсные пары".
- Trailing_wheel label "従輪".
- Trailing_wheel sameAs Běžné_dvojkolí.
- Trailing_wheel sameAs Laufradsatz.
- Trailing_wheel sameAs 従輪.
- Trailing_wheel sameAs Koła_toczne.
- Trailing_wheel sameAs m.05k53d.
- Trailing_wheel sameAs Q1385403.
- Trailing_wheel sameAs Q1385403.
- Trailing_wheel sameAs Trailing_wheel.
- Trailing_wheel wasDerivedFrom Trailing_wheel?oldid=570552251.
- Trailing_wheel depiction 462trailing.jpg.
- Trailing_wheel isPrimaryTopicOf Trailing_wheel.