When and how long does the chart gets prepared before the train departure?

When and how long does the chart gets prepared before the train departure?
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(Lakhan Singh Bhargav) #1

[My query is about train 22548]


(Prabhat Kumar) #2

@Lakhan_Singh_Bhargav
Chart preparation takes place twice - once 4 hours before scheduled departure time of train while second and final chart is prepared 30 minutes before the departure time.