| 1 | A | B | C | D | E |
| --- | --- | --- | --- | --- | --- |
| 2 | Articulated buses in London - Background |  |  |  |  |
| 3 | Route | Commenced | Ceased | Operator | Replaced by |
| 4 | 12 | 6 November 2004 | 4 November 2011 | London Central | double decker buses |
| 5 | 18 | 15 November 2003 | 12 November 2010 | First London | double decker buses |
| 6 | 25 | 26 June 2004 | 24 June 2011 | East London | double decker buses |
| 7 | 29 | 14 January 2006 | 25 November 2011 | Arriva London | double decker buses |
| 8 | 38 | 29 October 2005 | 13 November 2009 | Arriva London | double decker buses |
| 9 | 73 | 4 September 2004 | 2 September 2011 | Arriva London | double decker buses |
| 10 | 149 | 24 April 2004 | 15 October 2010 | Arriva London | double decker buses |
| 11 | 207 | 9 April 2005 | 9 December 2011 | First London | double decker buses |
| 12 | 436 | 8 February 2003 | 18 November 2011 | London Central | double decker buses |
| 13 | 453 | 15 March 2003 | 23 September 2011 | Selkent London General (1) | double decker buses |
| 14 | 507 | 5 June 2002 | 24 July 2009 | London General | single decker buses |
| 15 | 521 | 5 June 2002 | 31 August 2009 | London General | single decker buses |

Question: Which articulated vehicles in London were the first to be replaced?
Answer: The first articulated vehicles to be replaced were 507 and 521, which were replaced by single-deck buses in 2009.