CREATE TABLE table_6425 ("Make/ Model" TEXT, "length" TEXT, "Year" FLOAT, "Numbers  ( Quantity Ordered ) " TEXT, "Fuel Propulsion" TEXT)

How many years have a Make/ Model of new flyer c40lfr?
SELECT COUNT("Year") FROM table_6425 WHERE "Make/ Model" = 'new flyer c40lfr'
SELECT COUNT("Year") FROM "table_6425" WHERE "Make/ Model" = 'new flyer c40lfr'