Question: What is the manufacturer serial number of the 1963 withdrawn year?
SQL: SELECT "Manufacturer Serial numbers" FROM "2-15212127-2" WHERE "Year(s) withdrawn" = '1963';

Question: What was the year the MRWA with a wheel arrangement of 4-6-2 was introduced?
SQL: SELECT "Year introduced MRWA" FROM "2-15212127-2" WHERE "Wheel arrangement" = '4-6-2';