The Evolution Series is a line of diesel locomotives built by GE Transportation Systems, initially designed to meet the U.S. EPA's Tier 2 locomotive emissions standards that took effect in 2005. The first pre-production units were built in 2003. Evolution Series locomotives are equipped with either AC or DC traction motors, depending on the customer's preference. All are powered by the GE GEVO engine.

The ES44AC (Evolution Series, 4,400 hp, AC traction) replaced the AC4400CW model in the General Electric catalogue. These locomotives have been ordered by every Class I railroad in North America.

This dlc features the ES44AH (Heavy) in five different liveries.

Features: 

- animated drivers cabin
- animated wipers
- ACS coupling supported
- running numbers
- animated fans
- custom head and ditchlight
- weathering skins
- dynamic weathering
- alerter (dead man) function
- automatic DPU marker lights
- automatic DPU marker lights
- dynamic radio chatter
- advanced cabin sounds

Liveries:

- CSX 1827 Baltimore & Ohio
- CSX 1836 RF&P
- CSX 1850 Louisville & Nashville
- CSX 1851 NC&STL ES44AC 
- CSX 1852 Western Maryland