If so, then this August 19 you should be able to travel the first route of the DLC. Rush Hour :Boston Sprinter.
Embark for Boston, Providence and all intermediate points with this new Train Sim World 2 Rush Hour Boston Sprinter route and take one of the busiest and fastest rail lines in the USA aboard the Siemens ACS-64 Sprinter. “State-of-the-art Amtrak and the distinctive EMD F40PH-3C and MBB CTC-3 taxi cars from MBTA”. Because the gameplay added by the "Rush Hour" module is there: to provide passenger transport at peak times. For the occasion, the NPCs have been reviewed and improved: greater variety, new clothes, different walking behaviors and especially increased volumes according to the schedule.
For the historical side, dear to Dovetail for the presentation of each of the DLC, I refer you on the official game blog with a long and detailed article, written by Gary Dolzall, which traces the history of the road and the machines of this first part Boston Sprinter (FR version here with Google Translate).