CREATE TABLE table_46710 ("Name of System" TEXT, "Location" TEXT, "Traction Type" TEXT, "Date  ( From ) " TEXT, "Date  ( To ) " TEXT)

what is the date for traction type electric with calgary location?
SELECT "Date (From)" FROM table_46710 WHERE "Traction Type" = 'electric' AND "Location" = 'calgary'
SELECT "Date (From)" FROM "table_46710" WHERE "Location" = 'calgary' AND "Traction Type" = 'electric'