For trains departing from the source station on or after 10th June 2016. So for example, 12133 which departs from CSTM on 9th will run as per non-monsoon schedule officially but since KR crew takes over the train on 10th, it will run at reduced speeds as per the monsoon TT and end up getting delayed. It is always a confusing thing on June 10th with trains getting delayed due to the change in timings.