CREATE TABLE "4_6_6_4_construction_roster" (
  "railroad_quantity" text,
  "class" text,
  "road_numbers" text,
  "builder" text,
  "build_year" text
);

Question: what is the road numbers when the build year is 1943, the railroad (quantity) is clinchfield railroad (12 new, 6 secondhand)?
SQL: SELECT "road_numbers" FROM "4_6_6_4_construction_roster" WHERE "build_year"='1943' AND "railroad_quantity"='clinchfield railroad (12 new, 6 secondhand)';

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?
SQL: SELECT "road_numbers" FROM "4_6_6_4_construction_roster" WHERE "builder"='alco' AND "railroad_quantity"='union pacific railroad (105)' AND "class"='csa-2';

Question: what is the road numbers when the class is z-7?
SQL: SELECT "road_numbers" FROM "4_6_6_4_construction_roster" WHERE "class"='z-7';