1. Hydrogen Infrastructure
   1. Acquisition
      1. Next Tasks
         1. How Much Needed ?
            1. Quantity per route
         2. Contingency for Surplus
            1. How much storage ?
         3. No. of Stations ?
      2. Centralised
         1. Plasma
         2. Biomass
      3. Distributed
         1. Electrolysis
            1. Preferred
            2. Greener Electricity
         2. Steam Reformation
   2. Transport
      1. Trucks
         1. Quantity
         2. How many trips ?
   3. Depot Based Storage
      1. Pressure
   4. Refuelling
      1. Next Tasks
         1. Safety
         2. Where ? Depots ?
         3. Technical Requirements
2. Hydrogen Bus
   1. Power Source
      1. PEMFC - Fuel Cell
         1. 40-60% efficiency
         2. Specified to "Cruising" power requirement
         3. Decisions to be made
      2. Combustion Engine
         1. Up to 15% more efficient than a diesel or petrol
         2. Decisions to be made
   2. Fuel Storage
      1. How Much ?
   3. Power / Energy Storage
      1. Batteries
         1. Energy Storage Slower Charge / Release of power
      2. Super-capacitor
         1. Power Storage Fast Charge / Release of Power
      3. Decisions to be made
   4. Recapture
      1. Best used with power storage
   5. Propulsion System and Control
      1. Decisions to be made
         1. Transmission / Gear Box
         2. Direct Drive Motors
3. Network System
   1. Passenger Numbers / Usage
   2. Timing
   3. Data Logging
   4. Routes
   5. Network Infrastructure
      1. Depots
      2. Stops
4. Sustainability
   1. Emissions
   2. Cradle to Grave
      1. Boundaries of System
5. Global Scale Up