Question: On what date was the type 2-8-0 with a O4 LNER Class?
SQL: SELECT "Date" FROM "2-1169568-4" WHERE "Type" = '2-8-0' AND "LNER Class" = 'O4';

Question: Which class has less in quantity than 174 between the years 1921–23?
SQL: SELECT "Class" FROM "2-1169568-4" WHERE "Quantity" < 174.0 AND "Date" = '1921–23';

Question: Which type has a quantity of 11?
SQL: SELECT "Type" FROM "2-1169568-4" WHERE "Quantity" = 11.0;

Question: Which class has less than 3 in quantity with  a type of 4-6-0?
SQL: SELECT "Class" FROM "2-1169568-4" WHERE "Type" = '4-6-0' AND "Quantity" < 3.0;