Table:
text: Taff Vale Railway O4 class
Builders and numbering
Builders and numbering
Year_ Quantity Manufacturer Serial_Number TVR_Numbers GWR_Numbers
1907 7 Manning Wardle 1698–1704 38, 43, 59, 67–69, 94 285, 287, 293–295, 420, 296
1908 7 Beyer, Peacock & Co. 5095–5101 39, 95, 97, 98, 101, 102, 104 286, 297–302
1908 7 Beyer, Peacock & Co. 5127–5133 6, 9, 48, 56, 58, 105, 111 280, 282, 289, 291, 292, 236, 314
1910 10 Beyer, Peacock & Co. 5384–5393 13, 49, 112–116, 118, 119, 121 409, 290, 315, 317–321, 324, 333
1910 10 Vulcan Foundry 2529–2538 1, 28, 8, 17, 35, 36, 46, 108–110 278, 279, 281, 283, 284, 414, 288, 310, 311, 313

Question: What is the average year in the Taff Vale Railway O4 class with a crowd of 10 and a GWR number of 409, 290, 315, 317-321, 324, 333?