def stationboard(parameters)
      allowed_parameters = %w(station id limit transportations datetime)

      query = create_query(parameters, allowed_parameters)
      locations = perform('stationboard', query)

      locations['stationboard']
    end
def stationboard(parameters)
      allowed_parameters = %w(station id limit transportations datetime)

      query = create_query(parameters, allowed_parameters)
      locations = perform('stationboard', query)

      locations['stationboard']
    end
=> find station boards