question: What year is the date when the boiler type is forward topfeed, the built at is Crewe, and lot number is less than 187?
answer: SELECT COUNT(date) FROM table_name_94 WHERE boiler_type = "forward topfeed" AND built_at = "crewe" AND lot_no < 187
context: CREATE TABLE table_name_94 (date VARCHAR, lot_no VARCHAR, boiler_type VARCHAR, built_at VARCHAR)