Which parishes have a railroad length of 51.8 meters? 
CREATE TABLE "tunnels" (
  "no" real,
  "name" text,
  "mi_from_kingston" text,
  "km_from_kingston" text,
  "parish" text,
  "length_feet" real,
  "length_meters" text
);
SELECT "parish" FROM "tunnels" WHERE "length_meters"='51.8';