Railworks America

I have found that I have the SECPack by RSC in my assets folder. I have searched the DLC to figure out which package that came in, but can't find it. Likewise did a google search. Can someone please advise me how I got those assets?

I have bought the NEC, Phorum Penninsula, the Challenger, the Bigboy, but it doesn't come with any of those.

The SEC Pack came free with the update to TS 2012. It has the new High Speed English train in it.