What is the build date of the locomotive with a fa-2 model?
CREATE TABLE "cab_units_fa_fp_series" (
  "model" text,
  "specification" text,
  "build_date" text,
  "total_produced" real,
  "wheel_arrangement" text,
  "prime_mover" text,
  "power_output" text
);
SELECT "build_date" FROM "cab_units_fa_fp_series" WHERE "model"='fa-2';