Thank you! That is much appreciated, and I am glad you are enjoying them. As for the doors, you will need the Simple IC mod, located here: Interactive Control | ModHub | Farming Simulator (farming-simulator.com) to be able to open doors. Once you have this mod installed, you will see an "x" once you walk up to the doors on the passenger cars, the boxcars, and the livestock cars. That is how you open the doors. I hope this translates well!
Yes the latest update included an update to the livestock car that allows it to load cattle! only cattle right now, I will add other animals soon. You still have to get the railcar into the store area for the livestock tho, same as if you were using a semi livestock trailer so you have to get creative with the tracks sometimes.. haha