The RMC origins date back to June 1957 when London Transport took delivery of CRL4, this fourth and final prototype Routemaster had an ECW body designed specifically for use on the Green Line network. The most notable outward difference affected the rear which was modified to allow the fitting of electrically operated platform doors.

CRL4 entered service in October 1957 on route 721, after some early teething problems were sorted out the bus moved from Romford to High Wycombe where it took up duties on route 711. Public reaction to the bus was favourable resulting in London Transport ordering 68 Park Royal bodied vehicles in 1961, originally it was planned that these would be called the CR class (Coach Routemaster) however this was changed to RMC before the first one were delivered in 1962.
The batch RMC1453 to 1520 were very similar to the prototype expect for the front layout which apart from twin headlamp's was to the then standard RM design. The first buses entered service on route 715 operated by Guildford Garage on August 29th 1962. The rest of the class quickly followed resulting in a total of 8 routes being converted to the type.
CRL4's frontal area was eventually modified to match the production vehicles and the bus was classified RMC4 however it remained unique as only Routemaster not carry a Park Royal Vehicles built body.

During 1964 it was decided to make some modifications to the outward appearance of the vehicles, these changes saw the size of the front air intake grille below the front destination reduced by half thus allowing the light green band to continue right across the front. The radiator and wings were also changed, the brake cooling grilles below the head lamps were either paneled over or removed while the original radiator grille was changed to incorporate the triangular AEC badge. At the same time the registration plate which had previously been incorporated in the grille design was repositioned below this allowed an unbroken chrome surround to be fitted. The front intermediate blind box was also enlarged to the same width as the lower destination screen. At the rear the by then disused off-side route number box was also removed.

An order for a further batch of 43 Green Line vehicles was placed in 1964, these however were based on the new longer version of the Routemaster, the batch numbered RCL2218-2260 were all delivered during mid 1965 and apart from the extra half bay were to the same general design as the modified RMC's.

The Routemaster coaches continued to work on the Green Line network even after the transfer of the country area to the new National Bus Company controlled London Country. From 1972 onwards their roll was set for change after the management decided that the Green Line services would be better served using one man operated single deck vehicles, thus the Routemasters were replaced by new RP & RC class AEC Reliances, the redundant double deckers were quickly demoted to bus services where they mainly replaced the ageing fleet of RT's & RF's.
Gradually the RMC's were repainted into the standard National Bus Company green and white livery.

As an economy measure London Country was committed to full one man operation of all it's routes and from 1977 onwards the Routemasters began to be withdrawn on mass, in October 77 it was announced that London Transport would purchase 38 surplus RMC's, the last RMC, the prototype RMC4 was withdrawn from service by London Country in May 1979 and apart from it, all the other serviceable RMC buses eventually passed to London Transport were they were used as driver trainers and staff buses.

During 1989 London Buses' East London division converted six surplus RMC's for use on the new Beckton Express X15 service, these eventually passed to Stagecoach East London where they continued to operate the X15 until it conversion to one person operation.

Sadly only a handful of RMC's saw further public service after their withdrawal from the streets of London, the vast majority heading straight to scapyards of North Yorkshire.

   This model has the same level as detail as the earlier RMA release and again EFE have managed to capture the general shape and character of the RMC. The rear profile includes the four leaf platform doors and the emergency exit. All the lower deck side and rear windows have the correct beading around them which is slightly raised on the casting and has been neatly picked out with green paint on this first release.