Volvo Ailsa B55. The Volvo Ailsa B55 was a front-engined double-decker bus chassis manufactured in Scotland by Ailsa, Volvo's British subsidiary in which it owned 75%, from 1974 until 1985.

Versions

The B55 was designed with a front-mounted engine that still allowed a front entrance position suitable for one-person operation. In this sense there was a common goal with the earlier, unsuccessful, Guy Wulfrunian. It was fitted with the Volvo TD70 engine, a compact turbocharged unit of 6.7-litres. The rest of the design was relatively simple, with beam axles and leaf springs. A Self-Changing Gears semi-automatic gearbox was used. It first appeared at the 1973 Scottish Motor Show.

The most popular bodywork was the Alexander AV type, replaced by the R type from the earlier 1980s. The Falkirk based Alexander factory thus meant that the Alexander bodied Ailsa B55s were entirely built in Scotland, a significant factor in securing Scottish orders (notably from the Scottish Bus Group, Strathclyde Passenger Transport Executive and Tayside Regional Council) especially given the ease in securing locally sourced spare parts and repairs.

A prototype low height Ailsa, designated B55-20 (instead of the standard B55-10), was built for Derby Borough Transport in 1975.

In 1977, an improved Mark II version appeared, with two transmission options offered, a Self-Changing Gears pneumocyclic unit and a Voith D851 with retarder. It was followed in 1980 by a Mark III version, for which the Ailsa name was dropped. This continued to use the Volvo TD70H turbocharged engine, and utilised a Volvo truck rear axle in place of the previous troublesome axle.  Air suspension was also an available option. In 1981, a 3-axle version was developed to meet the demand for 3-axle buses in Asia.

Following the end of production in 1985, the Ailsa B55 was effectively replaced by the mid-engined Volvo B10M Citybus.

Operators
The Ailsa B55 type was particularly popular with the Scottish Bus Group: of all the constituent divisions, Northern and Lowland were the only ones never to adopt the Ailsa into their fleets. Strathclyde PTE was a significant buyer of the Ailsa, but not until the introduction of the Mk III. By far the most enthusiastic supporter of the Ailsa was Tayside Regional Council who bought 161 examples for use on their Dundee city services between 1976 and 1984, with four different body types, Alexander AV and RV, Northern Counties and East Lancs.

The B55 was popular with the passenger transport executives, with significant purchases made by West Midlands and South Yorkshire and to a lesser degree Merseyside and Tyne & Wear. Other customers included Cardiff Bus, who purchased 36 new with Northern Counties bodywork between 1981 and 1984 as well as acquiring second-hand examples, and the National Bus Company subsidiary Maidstone & District Motor Services for operational trials against the Bristol VRT and the Scania Metropolitan; the Ailsas proved unpopular with both passengers and employees, the latter of whom went on strike in the summer of 1976 due to poor ventilation inside the bus, and were withdrawn by 1983. Ayrshire independent operator A1 Service, whose operating area included the Ailsa plant in Irvine, also purchased several of the vehicles new, increasing its fleet, where it could, through the purchase of used vehicles.

As part of its Alternative Vehicle Evaluation programme, London Transport took delivery of three Mark III vehicles in 1984. The programme was intended to evaluate alternative vehicle types for future fleet replacement in London, which, at that time, was purchasing Leyland Titans and MCW Metrobuses.

The most interesting of the three vehicles was fleet number V3. This vehicle maintained the usual front entrance door, but had an additional exit behind the rear axle and a second staircase adjacent. This had the advantage of improving passenger flow during loading and off-loading at peak times. But the second staircase created a blind spot for the driver and the vehicle was restricted to crew operation. The vehicle remained unique, although London Buses rebuilt the rear, removing the doors, but leaving the staircase in place. After a fatal crash on a stormy night in which V3 crashed into a Mini and turned over on its side, the bus was sold for scrap. V3 was rescued from a scrap dealer by Black Prince Buses and extensively rebuilt, retaining both staircases. In March 2006, it was purchased by Roger Wright's London Bus Company and can now be seen restored to London condition at rallies and running days across Southern England.

No further orders for new B55s were placed by London Transport, but numerous second-hand examples were purchased from the South Yorkshire and West Midlands PTEs in the late 1980s.

A solitary Ailsa chassis was bodied as a single-deck bus by Marshall for Strathclyde PTE. Later, the same operator created a second single-decker, by converting an Alexander-bodied double-decker, the upper deck of which had been damaged.

A number of 2-axle Ailsa B55 were sold overseas. Indonesia received 320 buses between 1981 and 1985. China Motor Bus in Hong Kong received eight between 1975 and 1978 (six out of these eight buses were destroyed by fire). One B55 was exported to Singapore as a demonstrator for Singapore Bus Services and another to Bangkok.

A total of three 3-axle Ailsa B55s were built for export, two were sold to China Motor Bus as demonstrators, and the third was exported to Indonesia.

In all, just over 1,000 B55s were built, 890 of them being bodied by Alexander. Of the remainder, 64 Ailsas received unusual Van Hool McArdle bodies built in Dublin - 62 buses for the South Yorkshire PTE and two for A1 Service, Ayrshire. Northern Counties bodied some for Derby Corporation and Cardiff Bus, a total of 35 were also bodied by East Lancs Coachbuilders for Tayside, and a small number were also bodied by Marshall for Strathclyde and Derby Corporation.

The last significant number of Ailsas in service in the UK were operated by Cardiff Bus, who maintained 18 of the type in regular service by 2007 following extensive refurbishment. They were withdrawn at the end of 2007. However, as at February 2014, ten Ailsas remain in service for school work, school contracts and rail replacement with Edwards Coaches of South Wales.

Preservation

There are now around 30 Volvo Ailsas in preservation, with the Glasgow Vintage Vehicle Trust having six. The Sheffield based 388 Group have 1 Van Hool bodied example. The other, A1 Service PSJ 824R now resides at the Glasgow Vintage Vehicle Trust, previously being based in Sheffield. With Tayside being the most prolific buyer of the Ailsa, there are also a significant number in various stages of restoration with Tayside Vintage Vehicle Society, and two preserved examples regularly visit rallies and events throughout the country, WTS 273T and the open top WTS 272T.

A number of Cardiff Bus Volvo Ailsas have been preserved, one such example being NDW412X, owned by the 302 Group.

References

Bibliography
Jack, A.D. (1997). Volvo Bus: 25 Years of Progress. Venture Publications Ltd. .
Booth, Gavin (1983). The British Bus Today and Tomorrow. London: Ian Allan Ltd. .
Townsin, Alan (1985). The British Bus Story - The Late 'Seventies - The Calm Before the Storm. The Transport Publishing Company. .

External links

Vehicles introduced in 1973
Ailsa B55
Double-decker buses
Tri-axle buses
Bus chassis