CREATE TABLE "list_of_street_railways_in_canada" (
  "name_of_system" text,
  "location" text,
  "traction_type" text,
  "date_from" text,
  "date_to" text
);

Question: what is the date for traction type electric with calgary location?
SQL: SELECT "date_from" FROM "list_of_street_railways_in_canada" WHERE "traction_type"='electric' AND "location"='calgary';

Question: Which date has date started from 30 Sep 1913?
SQL: SELECT "date_to" FROM "list_of_street_railways_in_canada" WHERE "date_from"='30 sep 1913';