Please extract the stops of the South Western Mail in order in a list delimited by underscores and exclude return service.

Context: The South Western Mail was introduced as a twice weekly service in 1910. Upon the opening of the line to Dirranbandi, the train departed Brisbane at 20:45, arrived at Warwick 04:00, Goondiwindi 10:00 and Dirranbandi 16:30. The return service departed 11.30, arrived Goondiwindi 17.35, Warwick 23.35 and Brisbane 07.10 the following morning.

Answer: Brisbane_Warwick_Goondiwindi_Dirranbandi