CREATE TABLE table_7492 ("1st built" FLOAT, "1913 Class" CLOB, "W.A." CLOB, "No. Built" FLOAT, "Builder" CLOB, "Date" CLOB, "LNER Class" CLOB)

What is the W.A. of the 1 1st built?
SELECT "W.A." FROM table_7492 WHERE "1st built" = '1'
SELECT "W.A." FROM "table_7492" WHERE "1st built" = '1'