I suggest that he add to the collection of the New York - Trenton route the diesel - electric locomotive ALP45-DP or for a future New Jersey Transit route + addition of Comet IV + V cars and Comet IV and V Pilot Cars. (example: New York - Long Branch - Bay Head or New York - Dover (Morristown Line).
You forgot one route where they run High Bridge to NY Penn the Raritan Valley Line. In Game the 51xx trips are ALP-46 pans down you can see this at Newark Penn Station track 5. I have suggested the RVL to get the ALP-45DP. Comet IVs are the 5200s 6000s Comet V. The ones I know are Comet IV 5219 and Comet V 6043
Better to make its own route. In the Trenton dlc, you wouldn't be able to switch to diesel mode. Well, you could but the line is electrified so why not just use electric. Getting a full route with a dedicated diesel and ohle section gives more to do than to get a loco dlc and get much less to do
I think it would be good to introduce the ALP45-DP if we get the NJCL to from NY- BayHead just like how it was developed in TSC or even if we got a route like Suffern to Hoboken or Port Jervis to Hoboken. If the locomotive is featured as an addon for NYT, it more than likely would be in a scenario where there is a power failure or as an equipment extra. It would be cool to feature the MMC yard in Kearny to perform yard moves too.
That is a good suggestion too for the ALP45-DP. It can use the current MLV and even introduce the Comet V and Comet IV