Ok the next thing you should get Teamspeak 3(clinent).(it a free chat/talk program) You will need a mic. Now for Playing Multiplayer Sessions you need to download USA Prototype Multiplayer Session 5.5. After DLing it fine it and see if there any dependences missing? Right click on the session scroll down to View Dependences, then view it main list. Again scroll down if you see anything on the DLS,Down load it. After doing that,check the route & session for anymore missing dependences.(if so do if over)If there none then do a Extentent Batabace Repair,after that is done,close trainz,restart your computer.Larnch trainz go to routes,click the star near the top left side,(Make it dark)Now all the routes will be displayed. Fine USA PROTOTYPE MULTIPLAYER V5.5 click on it then click sessions. Now wait tell Danny5 Session is displayed click on it then click on join session.
Contact me on TS @ 24.34.133.237(it must be typed in with the dots)