One of the perks of working for BNSF in Spokane is there is quite a bit of GN track (spurs and branch) left. So when ever I work a train that operates on those lines (mainly the Chewela turn and the mead switch) when I have a minute I look for date nails. There are not many left and I have had the best luck in more remote area's but so far I have found a few. I have 57/61/and 68 so far. I even found one in Hauser yard but I was not aware the NP used them so I think they must have recycled the tie from somewehere else.