CREATE TABLE table_204_131 (id NUMBER, "tops design code" CLOB, "electrical system" CLOB, "max speed" CLOB, "weight" CLOB, "brakes" CLOB, "route availability" NUMBER, "notes" CLOB)

what 's the total design variations with vacuum brakes ?
SELECT COUNT("tops design code") FROM table_204_131 WHERE "brakes" = 'vacuum'
SELECT COUNT("tops design code") FROM "table_204_131" WHERE "brakes" = 'vacuum'