If you start from boarding, those two baggage trains drive off because they're empty and you aren't going to get cargo loaded with empty baggage trains. They're there because if you finish a flight and pull into the gate, you would start with the de-boarding first, in which case, those empty baggage trains would get into position in preparation for cargo unloading. As far as the starting position of those vehicles, that depends on how the AFCAD is built since they appear from a vehicle parking location as far as I recall. As far as the containers, make sure you have your capacity set BEFORE you load up GSX, otherwise it takes what you currently have on board if you're empty.