For DC users it is a one time purchase and will work with All the BlueLine and Paragon2 engines on the market

and opened up nearly every steam passage to improve the flow of steam in and out of the cylinders

The Trainz SKU for this item is P12287891

This is a USA Trains 14135 G Canadian National The Ultimate Series 4-Bay Center Flow Hopper #377732

The Trainz SKU for this item is P11451209

Tomar Industries 620 UP City of Portland lwrnd DwDetails-25.05-14.50-36.00-12.00-12.00-2 For DC users it isThis is a Tomar Industries 620 UP City of Portland lwrnd Condition: Factory New (C 9) Operational Status: Functional Original Box: Yes (P 9) Manufacturer: Tomar Industries Model Number: 620 Scale Era: HO Scale Model Type: Miscellaneous The Trainz SKU for this item is P11545762. Trainz Product Id: 11545762