CREATE TABLE "1871_1878" (
  "class" text,
  "wheel_arrangement" text,
  "manufacturer" text,
  "year_made" text,
  "quantity_made" text,
  "quantity_preserved" text,
  "year_s_withdrawn" text,
  "comments" text
);

Question: What year was the wheel arrangement 0-6-0 and a class 302?
SQL: SELECT "year_made" FROM "1871_1878" WHERE "wheel_arrangement"='0-6-0' AND "class"='302';

Question: How many have a class of 330?
SQL: SELECT "quantity_made" FROM "1871_1878" WHERE "class"='330';

Question: What comments are made in 1875?
SQL: SELECT "comments" FROM "1871_1878" WHERE "year_made"='1875';