[['class', 'wheel arrangement', 'fleet number (s)', 'manufacturer', 'serial numbers', 'year made', 'quantity made', 'quantity preserved'], ['mallet and simple articulated locomotives', 'mallet and simple articulated locomotives', 'mallet and simple articulated locomotives', 'mallet and simple articulated locomotives', 'mallet and simple articulated locomotives', 'mallet and simple articulated locomotives', 'mallet and simple articulated locomotives', 'mallet and simple articulated locomotives'], ['z', '2 - 6 - 6 - 2', '3000 - 3015', 'baldwin', '30566…31557', '1907', '16', '0'], ['z - 1', '2 - 6 - 6 - 2', '3100 - 3105', 'baldwin', '34389…34483', '1910', '6', '0'], ['z - 2', '2 - 8 - 8 - 2', '4000 - 4004', 'baldwin', '34382 - 34386', '1910', '5', '0'], ['z - 3', '2 - 8 - 8 - 2', '4005 - 4025', 'alco', '52839…62472', '1913 , 1917 , 1920', '21', '0'], ['z - 4', '2 - 8 - 8 - 2', '4500 - 4503', 'alco', '64373 - 64376', '1923', '4', '0'], ['z - 5', '2 - 8 - 8 - 4', '5000', 'alco', '67578', '1928', '1', '0'], ['z - 5', '2 - 8 - 8 - 4', '5000 - 5011', 'baldwin', '61292…61495', '1930', '11', '0'], ['z - 6', '4 - 6 - 6 - 4', '5100 - 5120', 'alco', '68760 - 68780', '1936 - 1937', '21', '0'], ['z - 7', '4 - 6 - 6 - 4', '5121 - 5126', 'alco', '69540 - 69545', '1941', '6', '0'], ['z - 8', '4 - 6 - 6 - 4', '5130 - 5149', 'alco', '70143…71962', '1943 - 44', '20', '0']]
the Wheel Arrangement for the Class Z - 5 were the same , but they were built in different Year
the [ENT] for the [ENT] [ENT] were the same , but they were built in different [ENT]