The following have endorsed passage and financing of the Texas Rail Relocation and Improvement Fund:
- Alamo Area Council of Governments
- Alamo Regional Mobility Authority
- Alliance for Public Transportation
- Amarillo Globe-News
- Austin American-Statesman
- Austin Energy
- Austin-San Antonio Commuter Rail District
- Bexar County
- Borderland Mobility Coalition
- Camino Real Regional Mobility Authority
- Capital Area Regional Transportation Planning Organization
- Capital Area Transportation Coalition
- City of Amarillo
- City of Austin
- City of Buda
- City of Cibolo
- City of El Paso
- City of Fort Worth
- City of Georgetown
- City of Kyle
- City of Lockhart
- City of Nacogdoches
- City of San Marcos
- City of Selma
- City of Socorro
- City of Victoria
- City of Weslaco
- Comal County
- CPS Energy
- Dallas Chamber of Commerce
- Dallas Morning News
- Denton County
- East Texas Corridor Council
- Economic Alliance Houston Port Region
- Ector County
- Fort Worth Star-Telegram
- Georgetown Chamber of Commerce
- Greater Houston Partnership
- Greater San Antonio Chamber of Commerce
- Harris County
- Harrison County
- Hays County
- Houston Chronicle
- Justin Economic Development Corporation
- National Association of Railroad Passengers
- Port San Antonio
- Real Estate Council of Austin
- Regional Transportation Council of the North Central Texas Council of Governments
- Richardson Chamber of Commerce
- SAMCO - San Antonio Mobility Coalition
- San Antonio Express-News
- San Antonio-Bexar County
- Texas Metro Chambers
- The North Texas Commission
- VIA - Advanced Transportation District
- Victoria Advocate
- Waco Herald-Tribune
- Williamson County Commissioners Court