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            Full Moving Block (FMB) Concept and Requirements Specification for Railroad Operations
      

      
  Document Series
              Research Results


      
  Author
          Federal Railroad Administration


      
Report Number
              RR 23-23

  Office
              RDI-23


      Subject
                    Communications,
                    Train Control


      
  Keywords
              Alternative Broken Rail and Rollout Detection (ABRRD), Full-moving block (FMB), Quasi-moving block (QMB), Interoperable Train Control (ITC), Positive Train Control (PTC), communications-based train control (CBTC)


      

      
      
              
                  
      
              
  Document
              FMB Concept and Specs.pdf (441.09 KB)

      
              The Federal Railroad Administration sponsored Transportation Technology Center, Inc., (MxV Rail), in collaboration with a rail industry stakeholder technical advisory group (TAG), to refine concepts and develop interoperable requirements for the Full Moving Block (FMB) method of train control. The team worked to develop an FMB Concept of Operations (ConOps) document with a focus on interfacing with alternative broken rail and rollout detection (ABRRD) system architectures; develop an Incremental FMB System and Segment Requirements Specification document; develop ABRRD system requirements; redline the Interoperable Train Control (ITC) Office-Locomotive Segment Interface Control Document (ICD), as well as the ITC Wayside-Locomotive Segment ICD, to capture recommended changes; develop migration considerations; and conduct a preliminary safety analysis. Research was conducted from May 2020 to September 2022.
      
            
      
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              Last updated: Wednesday, November 29, 2023 U.S. DEPARTMENT OF TRANSPORTATION

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