CREATE TABLE table_64262 ("Class" TEXT, "Railway number ( s ) " TEXT, "Quantity" TEXT, "Year ( s )  of manufacture" TEXT, "Type" TEXT)

What is the railway number of the aw class?
SELECT "Railway number(s)" FROM table_64262 WHERE "Class" = 'aw'
SELECT "Railway number(s)" FROM "table_64262" WHERE "Class" = 'aw'