Your answer is 89,481
Calculations:
10,000 + 80,002 - 521 = 89, 481
521 + 152451 = 152972
10000
267
24 + 521 + 9 + 4249 + 455 + 607 + 899 + 78 + 7 = 6,849
1000 plus 10000 equals 11000
276 + 245 = 521
516 + 505 = 521
I was looking for another in the series and discovered that 80002 is on the Keighley and Worth Valley Railway. Hope this of some help Jim McLaughlin
25 + 10000 = 10025.
40000 + 10000 = 50000
42003 + 10000 = 52003
5000 + 8250 + 100 + 1000 + 6500 + 1000 + 6500 + 1500 + 1500 + 10000 + 1000 + 10000 + 100 + 8250 + 5000 + 5000 + 8250 = 78,950