The format of the APT-P drawing number consists of an A followed by
• Identifying letter of train area (see table below)
• Size of drawing sheet
• Number
separated by dashes.
| Design Group | Train Area | Identifier |
|---|---|---|
| Mechanical | Power Bogie | A |
| Trailer Bogie | B | |
| Tilt Suspension | C | |
| Main Brakes | D | |
| Supplementary Brakes | E | |
| Mechanical Transmission | F | |
| Pantograph System | G | |
| Electrical | Electrical Power Equipment | H |
| Auxiliary Electrical Equipment | I | |
| Train Control System | J | |
| Local Control System | K | |
| Vehicles | Power Car Structure | L |
| Intermediate Trailer Car Structure | M | |
| Driving Trailer Car Structure | N | |
| Van Trailer Car Structure | O | |
| Power Car Equipment & Installation | P | |
| Intermediate Trailer Car Equipment | Q | |
| Driving Trailer Car Equipment | R | |
| Van Trailer Car Equipment | S | |
| Catering Vehicles Equipment | T | |
| Passenger Fittings & Furnishings | U | |
| Crew Fittings & Furnishings | V | |
| Catering Fittings & Furnishing | W | |
| Performance / Train Configuration | X | |
| Commissioning, Maintenance & Ops Support | Y | |
| Miscellaneous | Z |
|
|