The locomotive to go with this car set can be found under item number 88438

The Trainz SKU for this item is P12137507

so you can see in the tunnel passage into that)

Model Number: 931-1420

Trainz Product Id: 12179289

Broadway Limited 5826 HO Union Pacific Challenger 4-6-6-4 Steam Locomotive #3978 ProductID_12332391 The locomotive to go withThis is a Broadway Limited 5826 HO Union Pacific Challenger 4 6 6 4 Two tone Gray Paint Oil Tender Steam Locomotive Paragon3 Sound DC DCC Smoke #3978. Industry Leading Features: NEW Paragon3 Sound & Operation System FEATURING ROLLING THUNDERTM with Authentic Sounds and Prototypical Operation in both DC and DCC environments. Synchronized PUFFING SMOKE with Chuff Sound. Separate whistle smoke. Variable Puffing Smoke Intensity and timing. Integral DCC