CREATE TABLE table_19643196_1 (fleet__number VARCHAR, transmission VARCHAR, engine VARCHAR)

What is the fleet number when the transmission is Voith D863.4 and the engine is Cummins ISL?
SELECT fleet__number FROM table_19643196_1 WHERE transmission = "Voith D863.4" AND engine = "Cummins ISL"
SELECT "fleet__number" FROM "table_19643196_1" WHERE "Cummins ISL" = "engine" AND "Voith D863.4" = "transmission"