Iron Horse Raid

Hello all,

I have been playing Division 2 for about 3 months regularly. I started collecting the Future Initiative  gear set and have the 4 pieces. I also obtain the new heling trap yesterday. 

However, it appears the last 2 gear pieces drop in the Iron Horse raid. I’m not sure if I’m doing something wrong but there never appears to be a pick up raid for Iron Horse. I have run Dark Horse raid several times.

Can someone tell me if I’m doing something incorrect?