This must be suitable for the iPhone 5 version of TRAINZ driver and the train must be complete to look identical like a 142 with real life sound effects, it must also be coated in Northern Rail's colours and logos and make the buzzer noise for when train is ready to depart
No. You cannot add content to Trainz Mobile unless it's official Auran DLC, and I can't see them making a Pacer to be honest. However, if you get the PC version of Trainz, they are a few available free from the DLS, but not for IPhone.