| AEC | Associated Equipment Company Chassis builder of the FRM |
| afc | automatic fare collection |
| B20 | "Quiet" Fleetline with Turbocharged O.690 engine |
| Central Area | London Transport's red bus area came under GLC control on 1-1-70 |
| Country Area | London Transport's green bus area became London Country on 1-1-70 |
| GLC | Greater London Council |
| TGWU | Transport and General Workers Union |
| LT | London Transport |
| LTPC | London Transport Passengers' Committee |
| MCW | Metro Cammell Weymann one of the Body builders of the DMS/DM |
| omo | one man operated later changed to... |
| opo | one person operated |
| PRV | Park Royal Vehicles one of the Body builders of the DMS/DM |
| standee | a standing passenger |
| BL | Bristol LH |
| D | a DM converted for dual opo or crew operation |
| DM | a crew operated DMS |
| DMS | Daimler Standee |
| FRM | Front entrance Routemaster |
| LS | Leyland single decker (National) |
| M | Metrobus |
| MB | Merlin Bus |
| MBA | Merlin Bus Red Arrow |
| MBS | Merlin Bus Standee |
| MD | Metropolitan Double Deck |
| RCL | Routemaster Coach Lengthened |
| RF | Regal Flat...or Regal Four |
| RM | Routemaster |
| RML | Routemaster Lengthened |
| RT | Regent Three...or Regent Type...or Revised Type |
| SM | Short Merlin (Swift) |
| SMD | SMS with centre doors blocked off |
| SMS | Short Merlin Standee (Swift) |
| T | Titan |
| XA | Experimental Leyland Atlantean |
| XF | Experimental Daimler Fleetline |