So, Bad Blood 2 is actually a mini-campaign of 3 missions - one being a brief introduction.
It follows the theme of trains from the first part, but develops it a lot - as bonus entertainment now you can have fun with an operating loco as well as some basic signals and switches (also luring guards in front of it running).
It also seems to suffer from the same issues as the first part - primarily from wanting to be too many things at once, at the cost of cohesion. Moreover, the locations tend to be really inconsistent - some look great, while others rather bland and unfinished.
The missions play OK for the most part. You got some goofing around, some classic thieving, a prison break. If you don't mind a completely disjointed story, it's totally playable. It's also a sure fit for any list of missions containing usable machinery.