human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Railroad (quantity), Class, Road numbers, Builder, Build year
###Question: what is the road numbers when the build year is 1943, the railroad (quantity) is clinchfield railroad (12 new, 6 secondhand)?
gpt
SELECT Road numbers FROM table WHERE Build year = 1943 AND Railroad (quantity) = clinchfield railroad (12 new, 6 secondhand)