user: Question: How many locomotives were made that were withdrawn in 1913?
Columns: ['Type', 'Fleet numbers', 'Quantity made', 'Date made', 'GSR Class', 'GSR Nos.', 'Withdrawn']
Types: ['text', 'text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['0-6-2T', 'DWWR 4 and 5', 2.0, '1897', '448', '448–449', '1940–50']
SQL:

assistant: SELECT SUM("Quantity made") FROM "Table" WHERE "Withdrawn" = '1913';