When we first arrived to our surprise was an L&N geep setting on the ready tracks coupled to KV&O RS11 431. These were assigned to one of the daily ore trains D&D Mining & Steel plant. The set pulled out of the ready tracks but took a while getting onto their train. Once they got back we saw why. They had gotten the 3rd unit. A recently purchased slug unit from Helix Rail Grinding Systems (HRGX) Still wearing HRGX colors too.