Available for TRS19 and newer are the 40ft celebration boxcar pack! 
You can find the details about this pack here.

*SALE* save up to 80% with the Steam planes, trains, and automobile feast event! 
Sale ends on 23 Sept at 10am PST / 11am MST / 12pm CST / 1pm EST.

Now available for TS3 - Razorback Classic Mission Pack! Details can be viewed here.

Razorback Classic has received a free update as well! Details can be viewed here.

Model Trainz: Germany is now available for TRS19, TRS22, and beyond!
Details about Germany can be viewed here.