Vehicle details
| Registration | NAX6M |
| Fleet no | RC573 |
| Date new | 9/73 |
| Chassis | RELH-4 Series 2 |
| Wheelbase (feet - ins) | 18-6 |
| Chassis no | 4-619 |
| Body manufacturer | Plaxton |
| Style | Panorama Elite coach |
| Seats | 47 |
| Body no | 733869 |
| Engine | Leyland 680 |
| Cylinders (no) | 6 |
| Engine capacity | 11.1 litre |
| Depot (Period 8-1975) | Cardiff (Gelligaer Street) |
| Fleet no 1975 | Unchanged |
| Fleet no 1983 | RC1128 |
| NBC livery date | Delivered |
| Withdrawn | After 7/84 |
| Notes |