Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_19643196_1 (year VARCHAR, transmission VARCHAR, engine VARCHAR)

### Question ###
Which year had a transmission of Voith D863.4 and a Cummins ISM engine?

### Accurate SQL ###

SELECT year FROM table_19643196_1 WHERE transmission = "Voith D863.4" AND engine = "Cummins ISM"