London Buses route 521
| 521 | |
|---|---|
| Overview | |
| Operator | Go-Ahead London |
| Garage | Waterloo |
| Vehicle | Alexander Dennis Enviro200EV |
| Peak vehicle requirement | 15 |
| Status | Defunct |
| Began service | 18 July 1992 |
| Ended service | 29 April 2023 |
| Predecessors | Route 501 Route 513 |
| Night-time | No night service |
| Route | |
| Start | Waterloo station |
| Via | Holborn St Paul's station Cannon Street |
| End | London Bridge bus station |
| Length | 3 miles (4.8 km) |
| Service | |
| Level | Monday to Friday |
| Frequency | About every 2-12 minutes |
| Journey time | 21-34 minutes |
| Operates | 06:29 until 00:33 |
London Buses route 521 was a Transport for London contracted bus route in London, England. It ran between Waterloo station and London Bridge bus station, and was operated by Go-Ahead London.
It was also one of two Red Arrow branded services. In 2016, routes 507 and 521 became the first battery electric bus routes in Central London, and the second operated by Transport for London, after route 312.