Line from Markers

Adding a line from markerLayer
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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Line from Markers</title>
  
  <meta name='viewport' content='width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no' />
  <script src='//api.tiles.mapbox.com/mapbox.js/v1.5.0/mapbox.js'></script>
  <link href='//api.tiles.mapbox.com/mapbox.js/v1.5.0/mapbox.css' rel='stylesheet' />
  
  <style>
    body { margin:0; padding:0; }
    #map { position:absolute; top:0; bottom:0; width:100%; }
  </style>
</head>
<body>
<div id='map'></div>
<script>
var map = L.mapbox.map('map', 'examples.map-zr0njcqy');

map.markerLayer.on('ready', function(e) {
  
  var line = [];

  this.eachLayer(function(marker) {
    line.push(marker.getLatLng());
  });

  var polyline_options = {
    color: '#000'
  };

  var polyline = L.polyline(line, polyline_options).addTo(map);

});
</script>
The code and documentation to mapbox.js is hosted on GitHub where you can contribute changes and improvements.