Guarantor Subsidiaries of Westinghouse Air Brake Technologies

Exhibit 22.1

Guarantor Subsidiaries of Westinghouse Air Brake Technologies

The obligations under the Company's US Notes, the 2022 Credit Agreement and the 2024 Credit Agreement have been fully and unconditionally guaranteed by certain of the Company's U.S. subsidiaries. Each guarantor is 100% owned by the parent company, with the exception of GE Transportation, a Wabtec Company, which has 15,000 shares outstanding of Class A Non-Voting Preferred Stock held by General Electric Company. The Euro Notes are issued by Wabtec Netherlands and are fully and unconditionally guaranteed by the Company.

As of September 30, 2024:

The US Notes, 2022 Credit Agreement and 2024 Credit Agreement

Issuer:    Westinghouse Air Brake Technologies Corporation

Guarantors:    GE Transportation, a Wabtec Company

RFPC Holding Corp.

Transportation IP Holdings, LLC

Transportation Systems Services Operations Inc.

Wabtec Components, LLC

Wabtec Holding, LLC

Wabtec Railway Electronics Holdings, LLC

Wabtec Transportation Systems, LLC

The Euro Notes

Issuer:        Wabtec Transportation Netherlands B.V.

Guarantor:    Westinghouse Air Brake Technologies Corporation