Table: stanier_class_5_4
Columns: br_no
lot_no
date
built_at
boiler_type

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?
SQL: SELECT COUNT("date") FROM stanier_class_5_4 WHERE "boiler_type" = 'forward topfeed' AND "built_at" = 'crewe' AND "lot_no" < 187