The Trainz SKU for this item is P11493284

start off on the right foot with a Kato UniTrack Starter Set

While they're shown as a specific scale

The Trainz SKU for this item is P11642040

Kadee 820 #1-Scale Straight Centerset Shank Couplers with Body Mount Gearboxes ProductID_11523603 The Trainz SKU for thisThis is a Kadee 820 #1 Scale Body Mounted Coupler with Straight Centerset Shank Coupler and Standard Draft Gear boxes (Black). One pair per package. Condition: Factory New (C 9) Operational Status: Functional Original Box: Yes (P 9) Manufacturer: Kadee Model Number: 820 Category 1: Parts Category 2: G Scale Parts The Trainz SKU for this item is P12258914. Trainz Product Id: 12258914