See How Tier 4 Locomotive Engines are Digitizing the Locomotive Industry | GE

@Life_N_Times_of_Shane_T_Hanson: Well, that's what my answer would've been as well, but hey, it's all for show, right? Lol.

@sauger1001: I got the context wrong - she didn't know what a Tier 4 Engine was, and she was asking for the viewers..... So it's a fair question. I think all this computer based stuff is great - till it stops working and you have to fix it - and pay for it all from your own pocket.