Passenger Carriage (PCR):
These train carriages can be built with maximum streamlined forms, because they will not be used to assist in exchanging the air inside underground tunnels.
Completely battery powered trains are out of the question for Africa at this time, because there is no electric power network that could off load enough excess electric power into it's batteries in a timely manner.
These trains will carry batteries that are charged when they are running on an active section of track.
In this context, an active section of track is a section whose Power Rail (PR) has electric power switched on to it.
Power Rail (PR) does not carry electric power at all times, only when it is activated by a train entering that section of track.
The batteries in the carriages are used to bridge electric power supply gaps anywhere on any part of a track for suitably short distances.
Example:
Moving to a bypass track in order to allow a long distance train to pass.
In order to deal with personal emergencies, the carriages can be designed so that two of them can be joined together, whereby a person, such as a conductor can sit in partially visible sight between the two carriages and be available for emergencies.
If the distance between stops is considered to be long, a passage way for passengers that goes past him should not be a problem.
As the number of passengers increase, one man could even take care of 4 carriages, depending on the line of sight, when the train is traveling in a straight line.
Even with free trade zones, some kind of All African ID card for use inside those zones may be required, because cross border checks are not made by conductors.