The top photo of ARC 666T is IIRC; the prototype of what NCT wanted as it's standard double-decker.
Nottingham was always something of a forthright operator with it's own ideas on what it wanted for it's requirements. Although the bus depicted here is based on a Leyland Atlantean chassis, I'm sure that Leyland were persuaded to fit their turbocharged '690' unit in lieu of the then-standard 0.680 engine.
The body was (IIRC again), an East Lancs job heavily modified to NCT's requirements.
Basically then, it was something of a 'concept' bus.
Next down is an iconic Routemaster.
This one's the 30ft 'RML' version, and I do hope that it's still powered by the splendid 9.6-litre AV590 engine. The brilliant RM concept was the result of collaboration between London Transport, AEC and Park Royal Vehicles. Across the variants, around 2700 Routemasters entered service in the Capital.
Basically, it's of integral construction with an all-aluminium body structure, has a front sub-frame (or 'wheelbarrow'), carrying the engine and coiled independent front suspension; and a rear sub-frame carrying a 'live' coil-sprung rear axle.
Apparently quite an expensive bus to initially purchase, (when compared with the contemporary AEC Regent V), the only other taker for the Routemaster was Northern General, who specified Leyland 0.600 engines and forward-entrance bodies.
The Barton D/D is a Leyland Titan PD1 (or maybe PD2?)
C'mon Mr DTM - tell us about the ingenious Barton operation!
Over to you mate ..............
