| Zone |
Total sector mileage (Mile) |
Y-class |
C-class |
| 1 |
1 - 250 |
8,000 |
10,000 |
| 2 |
251 - 500 |
8,000 |
13,000 |
| 3 |
501 - 1,000 |
10,000 |
15,000 |
| 4 |
1,001 - 1,500 |
13,000 |
20,000 |
| 5 |
1,501 - 2,000 |
15,000 |
25,000 |
| 6 |
2,001 - 3,000 |
20,000 |
33,000 |
| 7 |
3,001 - 4,000 |
23,000 |
35,000 |
| 8 |
4,001 - 6,000 |
33,000 |
48,000 |
| 9 |
6,001 - 7,000 |
33,000 |
50,000 |
| 10 |
7,001 or more |
48,000 |
63,000 |
|
| Zone |
Total sector mileage (Mile) |
Y-class |
C-class |
| 1 |
1 - 500 |
15,000 |
20,000 |
| 2 |
501 - 1,000 |
15,000 |
25,000 |
| 3 |
1,001 - 2,000 |
20,000 |
30,000 |
| 4 |
2,001 - 3,000 |
25,000 |
40,000 |
| 5 |
3,001 - 4,000 |
30,000 |
50,000 |
| 6 |
4,001 - 6,000 |
40,000 |
65,000 |
| 7 |
6,001 - 8,000 |
45,000 |
70,000 |
| 8 |
8,001 - 12,000 |
65,000 |
95,000 |
| 9 |
12,001 - 14,000 |
65,000 |
100,000 |
| 10 |
14,001 or more |
95,000 |
125,000 |
|