Question: What is the quantity for railway 263?
SQL: SELECT "Quantity" FROM "2-18843924-2" WHERE "Railway number(s)" = '263';

Question: What are the year(s) of manufacture for railway number(s) 26 (II) …63 (II) , 188–193?
SQL: SELECT "Year(s) of manufacture" FROM "2-18843924-2" WHERE "Railway number(s)" = '26 (II) …63 (II) , 188–193';

Question: What are the railway number(s) for year(s) of manufacture of 1905–1906?
SQL: SELECT "Railway number(s)" FROM "2-18843924-2" WHERE "Year(s) of manufacture" = '1905–1906';