Which railway number has 3 quantity?
CREATE TABLE table_name_19 (railway_number_s_ VARCHAR, quantity VARCHAR)
SELECT railway_number_s_ FROM table_name_19 WHERE quantity = 3
### Context: CREATE TABLE table_name_19 (railway_number_s_ VARCHAR, quantity VARCHAR) ### Question: Which railway number has 3 quantity? ### Answer: SELECT railway_number_s_ FROM table_name_19 WHERE quantity = 3