WP 2001
| First production GP20 |
GP20
| 25623 | 36 | 46400 |
WP 2002
| |
GP20
| 25624 | 14 | 93907 |
WP 2004
| |
GP20
| 25626 | 9 | 196974 |
WP 2005
| |
GP20
| 25627 | 11 | 46369 |
WP 2006
| |
GP20
| 25628 | 16 | 112276 |
WP 2007
| blt 7/60 to UP 483 |
GP20
| 26041 | 12 | 62913 |
WP 2008
| blt 7/60 to UP 485 |
GP20
| 26042 | 9 | 90553 |
WP 2009
| |
GP20
| 26043 | 11 | 227263 |
WP 2010
| Blt 7/60, Ret. 2/83, To PNC 3/88 by UP |
GP20
| 26044 | 17 | 133287 |