code: function Position(properties) {
              if (properties)
                  for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
                      if (properties[keys[i]] != null)
                          this[keys[i]] = properties[keys[i]];
          }
docs: Properties of a Position.
  @memberof transit_realtime
  @interface IPosition
  @property {number} latitude Position latitude
  @property {number} longitude Position longitude
  @property {number|null} [bearing] Position bearing
  @property {number|null} [odometer] Position odometer
  @property {number|null} [speed] Position speed
   
  Constructs a new Position.
  @memberof transit_realtime
  @classdesc Represents a Position.
  @implements IPosition
  @constructor
  @param {transit_realtime.IPosition=} [properties] Properties to set