CREATE TABLE table_56482 ("Class" CLOB, "Type" CLOB, "Quantity" FLOAT, "Date" CLOB, "LNER Class" CLOB)

What is the Quantity of Type 2-4-2t?
SELECT SUM("Quantity") FROM table_56482 WHERE "Type" = '2-4-2t'
SELECT SUM("Quantity") FROM "table_56482" WHERE "Type" = '2-4-2t'