Table:
text: List of Palatine locomotives and railbuses
Tank Locomotives
Tank Locomotives
Class_ Railway_numbers Quantity Years_of_manufacture Axle_arrangement_UIC_
None 70–73 ( de ) 4 1868 B n2t
P 2 II 88 (II) …95 (II) , 260–262, 264–284 31 1900–1902 1′B2′ n2t
P 5 310–321 12 1908 1′C2′ n2t
T 1 ( de ) 15 (II) …73 (II) , 177–186 31 1892–1897 B n2t
T 2 I ( de ) I–VIII 8 1865–1874 B n2t
T 2 II ( de ) VII (II) –X 4 1883–1884 B n2t
T 3 ( de ) 13 (II) …71 (II) , 202–208, 246–256 27 1889–1905 C n2t
T 4 I 44 (II) …56 (II) , 194–197 7 1895–1897 C1′ n2t

Question: Tender locomotives: From the list of Palatinate locomotives and railbuses, in which year was the axle unit b n2t manufactured, which has a number of 31 units?