CREATE TABLE table_16176 ("Serial number" TEXT, "Wheel arrangement  (  Whyte notation  ) " TEXT, "Build date" TEXT, "Operational owner ( s ) " TEXT, "Disposition" TEXT)

When was the train 2053 built?
SELECT "Build date" FROM table_16176 WHERE "Serial number" = '2053'
SELECT "Build date" FROM "table_16176" WHERE "Serial number" = '2053'