The Volvo B12M is an underfloor-engined bus

Bus

A bus is a road vehicle designed to carry passengers. Buses can have a capacity as high as 300 passengers. The most common type of bus is the single-decker bus, with larger loads carried by double-decker buses and articulated buses, and smaller loads carried by midibuses and minibuses; coaches are...

/coach

Coach (vehicle)

A coach is a large motor vehicle, a type of bus, used for conveying passengers on excursions and on longer distance express coach scheduled transport between cities - or even between countries...

 chassis introduced by Volvo Buses

Volvo Buses

Volvo Buses is a subsidiary and a business area of the Swedish vehicle maker Volvo, which became an independent division in 1968. It is based in Göteborg....

 in 2001 as a replacement for the Volvo B10M

Volvo B10M

The Volvo B10M is a popular mid-engined bus and coach chassis built by Volvo between 1978 and 2001. It was built as the successor of the B58 and was equipped with a 9.6-litre horizontally-mounted Volvo THD100/THD101/THD102/THD103/THD104/DH10A diesel engine mounted under the floor, near the middle...

. It is available with a variety of bodies such as Van Hool, Sunsundegui Sideral and Plaxton Panther/Paragon

Plaxton Paragon

The Plaxton Paragon and Plaxton Panther are closely related designs of coach bodywork built by Plaxton in Scarborough, England, since 1999, and still in production as of 2009....

. Large British users of the B12M include Wallace Arnold

Wallace Arnold

Wallace Arnold was one of the UK's largest holiday motorcoach tour operators. It was founded in 1912 and was named after its founders Wallace Cunningham and Arnold Crowe. By 1980 it operated 290 coaches from its headquarters in Leeds, and owned a subsidiary based in Devon...

, Park's Motor Group and WA Shearings. In Brazil, there's a bi-articulated

Bi-articulated bus

A bi-articulated bus or double articulated bus is an extension of an articulated bus in that it has three passenger compartment sections instead of two. This also involves the addition of an extra axle...

 version to Volvo B12M, built in Curitiba

Curitiba

Curitiba is the capital of the Brazilian state of Paraná. It is the largest city with the biggest economy of both Paraná and southern Brazil. The population of Curitiba numbers approximately 1.75 million people and the latest GDP figures for the city surpass US$61 billion according to...

. Also in Curitiba, there will be 94 bi-articulated Volvo B12M buses in a 28 meter configuration (10 of them are already in operation) , making it the world's longest bus.