Johnny B Good wrote:
Although the article mentions pretty well all aspects of DC motor
control as historically employed for railway locomotion, the use of a
journalistic style over a technical authoring one resulted in a confusion
of descriptive terms (eg currents instead of magnetic fields and the
impression that the [armature] windings on the rotor were wound *around*
the rotor shaft).
Although the author 'loses points' for the use of confusing terms, he
does gain points for his comprehensive coverage of the difficulties,
imposed by the limitations of the technology of the day, facing the
designers in their attempts to recover the braking energy for use by
other trains on the line.
OK, if you want a bit more reading, try these
Principles of Direct Current Electric Traction
https://archive.org/details/in.ernet.dli.2015.288435
Electric Traction
https://archive.org/details/in.ernet.dli.2015.19338
Chris
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Chris J Dixon Nottingham UK
Plant amazing Acers.