At Chennai Egmore railway station, the ticket counter has a single printer shared by 4 booking clerks. When Clerk 1 starts printing a 12-page reservation chart, Clerk 2 immediately sends a 3-page cancellation list. The printer finishes all 12 pages of the chart first, then prints the 3-page list. Clerk 3's single-page urgent VIP booking waits behind both, even though it arrived while the chart was still printing.