Yeah. It may be a tall order for DTG to do all this, even if it's just one P42DC and maybe all variants of the Superliner, including the transition car and the lounge car. I believe only a couple of those can layer on to existing routes and obviously Scenario Planner, while the rest are just in Scenario Planner. The two that are on existing routes is the Capital Limited and the Southwest Chief. All the rest are only going to be in Scenario Planner for now. All that includes the Coast Starlight, Empire Builder, California Zephyr, Sunset Limited, City Of New Orleans, and my favorite, the Texas Eagle. There is one more that I know, but I don't know if it's long distance or not, but it's the Heartland Flyer. It has a very interesting formation of one P42DC on each end sandwiching 3 Superliners. Services like the Pacific Surfliner is/are not included as they are using different types of equipment similar to Superliner, but as Surfliner and uses a different paint scheme. One more train that may be included is the Auto Train. More equipment I guess could be added is the P32-BWH, F40PH, and the ALC-42. The last locomotive I highly doubt though because of technical problems.
The Amtrak F40PH, P32-8BWH, and Siemens ALC-42 Charger are also possible choices for an Amtrak Long Distance DLC Pack.