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_name_8 ( road_numbers VARCHAR, class VARCHAR, builder VARCHAR, railroad__quantity_ VARCHAR )

### Question ###
what is the road numbers when the builder is alco, the railroad (quantity) is union pacific railroad (105) and the class is csa-2?

### Accurate SQL ###

SELECT road_numbers FROM table_name_8 WHERE builder = "alco" AND railroad__quantity_ = "union pacific railroad (105)" AND class = "csa-2"