CREATE TABLE "1890_1904" (
  "class" text,
  "wheels" text,
  "date" text,
  "no_built" real,
  "loco_nos" text,
  "comments" text
);

Question: Which class at 55 built?
SQL: SELECT "class" FROM "1890_1904" WHERE "no_built"=55;

Question: What is the Loco Nos of the e3 class?
SQL: SELECT "loco_nos" FROM "1890_1904" WHERE "class"='e3';