The Fourth Wave

The 4th running from 18604

A 18604 to 15183

B 15183 running upwards

a 15183 to 18887

b 18887 to 16828

c 16828 running upwards (Max 24500) 

1 16828 to 17863

2 17863 to 17554

3 17554 to 20222

4 20222 to 18837

5 18837 running upwards ( Max 24500)