user: Question: What was the year the MRWA with a wheel arrangement of 4-6-2 was introduced?
Columns: ['Wheel arrangement', 'Manufacturer Serial numbers', 'Year introduced MRWA', 'Quantity made', 'Quantity preserved', 'Year(s) withdrawn']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Steam locomotives', 'Steam locomotives', 'Steam locomotives', 'Steam locomotives', 'Steam locomotives', 'Steam locomotives']
SQL:

assistant: SELECT "Year introduced MRWA" FROM "Table" WHERE "Wheel arrangement" = '4-6-2';