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 is the number of class 08 models whos voltage is 90 v
SELECT COUNT(*) FROM table_204_131 WHERE "electrical system" = '90 v'
SELECT COUNT(*) FROM "table_204_131" WHERE "electrical system" = '90 v'