Talk:Railway electrification/to do


 * History needed
 * More example systems; reduce over-emphasis on one country or another
 * Links to articles that deal with specialised aspects
 * Need to add that the major problem with 50 or 60 Hz traction motors was commutation. This was the major reason for early electric railroads to use lower frequencies, in spite of
 * the extra volume and cost of transformers in generating stations, substations, and locomotives
 * the difficulties to interface the railroad power system with the industrial power system
 * as a case in point, the national French railroad (SNCF), which pioneered the single phase 50 Hz traction motor under the influence of its visionary CEO Louis Armand, experienced so much difficulty that it eventually settled, in the 1950's, on a motor-generator converter:
 * a single phase synchronous (collector-free) motor fed by the catenary that would run...
 * ...a three phase generator that would feed...
 * ...the three phase collector traction motors, whose commutation was much easier than those of their single phase counterparts.
 * contacting SNCF and asking them for some engineer who would remember those days could be helpful in finishing this article
 * Electrification studies in the Soviet Union (use/link-to Railway electrification in the Soviet Union
 * High voltage DC electrification proposals (30kv ?). The USSR experimented with 6kv. Power electronics used to reduce voltage.