CN 327 has quite a bit of power, with ET44AC CSX 3265, repainted AC4400CW CSXT 57, SD60 CN 5440 & ES44DC CN 2335 up front as it passes MP 14 of CN's Kingston Sub on a sunny afternoon.
Tier IV locomotives are the safest, cleanest, and most fuel efficient locomotives on the rails today. Unfortunately, most of them are ugly and are as quiet as an ACS-64.