| 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | |
|---|---|---|---|---|---|---|
| Total number | 2 350 | 2 472 | 2 414 | 2 222 | 2 054 | 2 085 | 
| by source of power | ||||||
| electric | 933 | 970 | 971 | 945 | 863 | 853 | 
| diesel | 1 390 | 1 474 | 1 416 | 1 247 | 1 162 | 1 201 | 
| steam | 27 | 28 | 27 | 30 | 29 | 31 | 
| Total tractive power (thous. kW) | 3 280 | 3 381 | 3 706 | 3 446 | 3 276 | 3 302 | 
| by source of power | ||||||
| electric | 2 050 | 2 142 | 2 530 | 2 435 | 2 308 | 2 299 | 
| diesel | 1 212 | 1 221 | 1 158 | 989 | 947 | 982 | 
| steam | 17 | 18 | 18 | 21 | 22 | 22 | 
Source: MD