Unitrans RT2819 is an ex-London Transport

London Transport Executive

The London Transport Executive was the organisation responsible for public transport in the Greater London area, UK, between 1948-1962. In common with all London transport authorities from 1933 to 2000, the public name and operational brand of the organisation was London Transport.-Creation:On 1...

 double decker bus operated in regular service by Unitrans

Unitrans

Unitrans is the name for the transit system which operates in Davis, California. It takes its name from an abbreviation of the words "University Transport". Excepting several managerial and maintenance positions, Unitrans is managed and operated entirely by students of the University of...

 in Davis, California

Davis, California

Davis is a city in Yolo County, California, United States. It is part of the Sacramento–Arden-Arcade–Roseville Metropolitan Statistical Area...

. In the early 1990s, RT2819's original British-made AEC diesel engine

Diesel engine

A diesel engine is an internal combustion engine that uses the heat of compression to initiate ignition to burn the fuel, which is injected into the combustion chamber...

 and Wilson pre-select

Preselector gearbox

A preselector or self-changing gearbox is a type of manual gearbox used on a variety of vehicles, most commonly in the 1930s...

 manual transmission was replaced with an American-made Cummins

Cummins

Cummins Inc. is a Fortune 500 corporation that designs, manufactures, distributes and services engines and related technologies, including fuel systems, controls, air handling, filtration, emission control and electrical power generation systems...

 diesel engine and an Allison

Allison Transmission

Allison Transmission is an American manufacturer of commercial duty automatic transmissions and hybrid propulsion systems. Allison products are specified by over 250 of the world’s leading vehicle manufacturers and are used in many market sectors including bus, refuse, fire, construction,...

 automatic transmission. In the early 2000s, RT2819's engine was again replaced, this time with a John Deere

Deere & Company

Deere & Company, usually known by its brand name John Deere , is an American corporation based in Moline, Illinois, and the leading manufacturer of agricultural machinery in the world. In 2010, it was listed as 107th in the Fortune 500 ranking...

 compressed natural gas (CNG)

Compressed natural gas

Compressed natural gas is a fossil fuel substitute for gasoline , diesel, or propane/LPG. Although its combustion does produce greenhouse gases, it is a more environmentally clean alternative to those fuels, and it is much safer than other fuels in the event of a spill...

 engine.

Technical specifications

Manufacturer (chassis

Chassis

A chassis consists of an internal framework that supports a man-made object. It is analogous to an animal's skeleton. An example of a chassis is the underpart of a motor vehicle, consisting of the frame with the wheels and machinery.- Vehicles :In the case of vehicles, the term chassis means the...

): Associated Equipment Company (AEC)

Manufacturer (coachwork

Coachwork

Coachwork is the body of a horse-drawn coach or carriage, a motor vehicle , a railroad car or railway carriage. Usually reserved for bodies built on a separate chassis, rather than being of unitary or monocoque construction...

): Park Royal Vehicles

Park Royal Vehicles

Dating its origins back to 1889, Park Royal Vehicles along with its Leeds-based subsidiary Charles H. Roe was one of Britain's leading coachbuilders and bus manufacturers based at Park Royal, west London, UK.-Associated Commercial Vehicles:...

Model (chassis): AEC Regent III RT

AEC Regent III RT

The AEC Regent III RT was a variant of the AEC Regent III. It was a double-decker bus produced jointly between AEC and London Transport. It was the standard red London bus during the 1950s.-Prototype:...

Model (coachwork): Park Royal 3RT3/8

Date built: 1952

Engine: John Deere

Deere & Company

Deere & Company, usually known by its brand name John Deere , is an American corporation based in Moline, Illinois, and the leading manufacturer of agricultural machinery in the world. In 2010, it was listed as 107th in the Fortune 500 ranking...

 compressed natural gas (CNG)

Compressed natural gas

Compressed natural gas is a fossil fuel substitute for gasoline , diesel, or propane/LPG. Although its combustion does produce greenhouse gases, it is a more environmentally clean alternative to those fuels, and it is much safer than other fuels in the event of a spill...

 with an automatic transmission

Automatic transmission

An automatic transmission is one type of motor vehicle transmission that can automatically change gear ratios as the vehicle moves, freeing the driver from having to shift gears manually...

Length: 27 feet, 6 inches

Width: 7 feet, 6 inches

Seating capacity: 56 (26 downstairs, 30 upstairs)

Original operator: London Transport

London Transport Executive

The London Transport Executive was the organisation responsible for public transport in the Greater London area, UK, between 1948-1962. In common with all London transport authorities from 1933 to 2000, the public name and operational brand of the organisation was London Transport.-Creation:On 1...

Original fleet number: RT2819

Original licence plate number: LYR 989

Date acquired by Unitrans: Before December, 1975

Current status: Unitrans Fleet - Active