1. Introduction
   1. History of train control, starting in early nineteenth century Britain
   2. This chapter has alluded to much of what will be covered in the beginning of this series: interlocking, vitality, train separation, and movement authority. The next couple chapters will continue to outline the requirements that a signaling system must fulfill for safe and efficient operation of a railway.
2. the safe braking model
   • to expand on first requirement: safe train separation
   1. trains cannot stop instantly
   2. callback to the distance signal, spaced at least one safe braking distance from the main signal
   3. braking curve, stopping distance is a function of speed
   4. to prevent trains from crashing into obstacles, enforce a distance of at least one safe braking distance from the maximum possible speed at that point
   5. to control braking distance, control speed
3. Interlocking
   • to expand on second requirement: interlocking
   1. note: terms: interlocking refers to the machine, the junction, and the concept. clarify what is meant where
   2. discussion of vitality
   3. route locking
   4. flank protection
   5. home signals
4. movement authority
   • to frame the jobs of the signaling system as including issuing movement authorities
   1. discuss older systems of movement authority
      1. token
      2. timetable
      3. take and release (if a source can be found)
   2. modern fixed block
      1. block signal system grants movement authority to the next signal(s) or through interlocking
      2. train detection: track circuits, axle counters, ultrasonic,
      • limited control interface (only at signals)
5. control lines
   1. control lines in a fixed block system
   2. limitations in delay recovery and headway in systems designed for higher speeds due to long control line length
   3. moving block
      • theory focused
      1. requires constant train control interface
6. implementing moving block
   • here's where we start getting into cbtc. chapter 6 might be a little late, but the people will learn patience.
   1. communication
      1. of position
      2. of movement authority (constant control interface)
   2. positioning
      1. localization
         1. loops
         2. transponders
         3. dead reckoning
         • mention radio based stuff briefly
         1. onboard database of right of way
7. CBTC architecture
   1. zone controller
   2. interlocking
   3. communication
   4. (optional) train detection
8. non-equipped trains and secondary train detection
   1. is it necessary?
   2. degraded modes
      1. grades of automation
9. real world implementations: LZB -> SelTrac
   • focus on seltrac
   • discuss differing vocabulary
   1. brief history
   2. architecture
   3. deployments
      • dlr
      • muni
      • skytrain
      • icts
      • flushing
10. real world implementations: SAET/Meteor
    1. --

long range:

1. LZB
2. ETCS
3. virtual coupling
4. ATS
5. interoperability