There is no 2100 series neither Keikyu railway stuff at all.
Japanese rolling stock on the DLS almost exclusively from JR East (hardly even JR West).
Private railway companies rolling stock was made by Keimei, but mostly a few Kansai area trains such as Hankyu 2300 and 2800, Keihan 8800, 9000 and 1000 and few Keihan stuff (Otsu Line 800 series).
The 2100 is something that i would love to see in trainz, just only to play with their "singing inverters"
https://www.youtube.com/watch?v=h5Aw_r4ZOZc&t=37s
But do not worry. In the meantime you can race angist also a Shikoku 2000 series (somewhere in the climax stage, by Hirochi), Keihan 800 series (third episode of burning stage, by Keimei), also if you're willing to spend something, you can repaint Jtrainz Keihan 8000 series (http://jtrainzstore.com/en/home/21-keihan-8000.html) into the two-tone green racer EMU of the Keihan sisters.
Nice trains and those sounds are among the best. I also wouldn't mind to see some Keikyu trains in trainz. In other news. I got a newsletter from J-trainz stating that the E3-Shinkansen (which I ordered last year) is finally making some progress so I hope it will be out in not a too short time. I don't mind waiting though as it is better not to rush the release. But yeah...exited to see a commissioned train on the rails.
For me:
I'm working on 2 projects:
Project 1: A Tane version of Electro Island. This will be a great version of Electro Island. It now looks so superb in the new engine. Will post some screenshots soon.
Project 2: The Icarus Shinkansen v 2.0. When finished it will be a great Shinkansen route. But it now also features a mainline, metro lines and etc...
As I do aso browse other forums (like JNS) it seems that many people who like Japanese content don't know that Trainz is probably now the train simulator with the most Japanese Content. Although BVE has also a lot. But maybe it will be worth to post there also some screenshots. Jtrainz started a topic there.
So Have a nice day all. Gonna start trainz within a short while to build further on the Icarus Shinkansen.