CREATE TABLE table_15850 ("Order Year" TEXT, "Manufacturer" TEXT, "Model" TEXT, "Fleet Series  ( Quantity ) " TEXT, "Powertrain  ( Engine/Transmission ) " TEXT, "Fuel Propulsion" TEXT)

what is the powertrain (engine/transmission) when the order year is 2000?
SELECT "Powertrain (Engine/Transmission)" FROM table_15850 WHERE "Order Year" = '2000'
SELECT "Powertrain (Engine/Transmission)" FROM "table_15850" WHERE "Order Year" = '2000'