CREATE TABLE table_51694 ("Locomotive" CLOB, "Type" CLOB, "Builder" CLOB, "Builder's No." CLOB, "Built" FLOAT, "Entered service" FLOAT, "Withdrawn" FLOAT)

With a Type of 4-6-4t, what is the sum Withdrawn?
SELECT SUM("Withdrawn") FROM table_51694 WHERE "Type" = '4-6-4t'
SELECT SUM("Withdrawn") FROM "table_51694" WHERE "Type" = '4-6-4t'