CREATE TABLE table_59727 ("Name  ( year commissioned ) " TEXT, "Owner/operator" TEXT, "Length" TEXT, "Maximum diameter" TEXT, "From/to" TEXT, "Licence number" TEXT)

Who is the owner/operator of the line from Kambalda to Esperance?
SELECT "Owner/operator" FROM table_59727 WHERE "From/to" = 'kambalda to esperance'
SELECT "Owner/operator" FROM "table_59727" WHERE "From/to" = 'kambalda to esperance'