Here is a sequence of numbers for you to puzzle over:
7 8 88 90 1 9 8 92 88 90 2 75 99 99 9 53 23 99 9 53 23 99 28 49 10 99 8 10 99 90 80 75 99 99
74 99 38 73 40 99 44 8 16 68 23 63 41 99 53 64 2 90 90 1 37 63 99 60 49 60 99 87 8 92 75 8 7 99 7 49 7 99
Also, no cacher would be silly enough to hide a cache on an active railway line, so don’t bother searching on railway track (this part is not a riddle, seriously don’t walk on railway tracks!)
You can check your answers for this puzzle on GeoChecker.com.