| TCRP E-01 | Innovative Maintenance Procedures for Transit Buses | Completed | |
| TCRP E-02 | Artificial Intelligence for Transit Railcar Diagnostics | Completed | |
| TCRP E-02A | Demonstration of Artificial Intelligence Technology for Transit Railcar Diagnostics | Completed | |
| TCRP E-03 | Inventory Management for Bus and Rail Public Transit Systems | Completed | |
| TCRP E-03A | Applications for Improved Inventory Management for Public Transit Systems | Completed | |
| TCRP E-04 | Guidelines for the Development of Public Transportation Management Systems | Completed | |
| TCRP E-05 | A Guidebook for Developing and Sharing Transit Bus Maintenance Practices | Completed | |
| TCRP E-06 | Transit Bus Mechanics: Building for Success--The ASE Transit Bus Maintenance Certification Test Series | Completed | |
| TCRP E-07 | Establishing a National Transit Industry Rail Vehicle Technician Qualification Program: Building for Success | Completed | |
| TCRP E-08 | Extending and Deepening National Transit Training Standards | Completed | |
| TCRP E-09 | State of Good Repair: Prioritizing the Rehabilitation and Replacement of Existing Capital Assets and Evaluating the Implications for Transit | Final | |
| TCRP E-09A | Guidance for Applying the State of Good Repair Prioritization Framework and Tools | Final | |
| TCRP E-10 | Maintenance Technician Staffing Levels for Modern Public Transit Fleets | Final | Completed. Published as TCRP Report 184 |
| TCRP E-11 | The Relationship Between Transit Asset Condition and Service Quality | Final | |
| TCRP E-12 | Guidance for Calculating the Return on Investment in Transit State of Good Repair | Final | |
| TCRP E-13 | COVID-19 and Transit Air Quality Protections (Insight Event) | Completed | Insight Event was hosted in the summer of 2022. Session records are posted online. |
| TCRP E-14 | Lithium-Ion Battery Transit Bus Fire Prevention and Risk Management | Active | |
| TCRP E-15 | Air Quality Inside Buses | Active | |