user: Question: Which builder has a railway of Rhodesia Railways?
Columns: ['Gauge', 'Railway', 'Class', 'Works no.', 'Year', 'Builder']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['3 ft 6 in', 'Rhodesia Railways', '15th', '6936–6939', '1940', 'Beyer, Peacock']
SQL:

assistant: SELECT "Builder" FROM "Table" WHERE "Railway" = 'Rhodesia Railways';