Leaflet Try It Now Routing Start End Marker Customization

var map = L.map('map', {
                    layers: MQ.mapLayer(),
                    center: [40.731701, -73.993411],
                    zoom: 12
                });

var dir = MQ.routing.directions();

dir.route({
                    locations: [
                        'wood-ridge, nj',
                        'staten island, ny',
                        'queens, ny'
                    ]
                });

CustomRouteLayer = MQ.Routing.RouteLayer.extend({
                    createStartMarker: function (location, stopNumber) {
                        var custom_icon;
                        var marker;

custom_icon = L.icon({
                            iconUrl: 'https://www.mapquestapi.com/staticmap/geticon?uri=poi-red_1.png',
                            iconSize: [20, 29],
                            iconAnchor: [10, 29],
                            popupAnchor: [0, -29]
                        });

marker = L.marker(location.latLng, {icon: custom_icon}).addTo(map);

return marker;
                    },

createEndMarker: function (location, stopNumber) {
                        var custom_icon;
                        var marker;

custom_icon = L.icon({
                            iconUrl: 'https://www.mapquestapi.com/staticmap/geticon?uri=poi-blue_1.png',
                            iconSize: [20, 29],
                            iconAnchor: [10, 29],
                            popupAnchor: [0, -29]
                        });

marker = L.marker(location.latLng, {icon: custom_icon}).addTo(map);

return marker;
                    }
                });

map.addLayer(new CustomRouteLayer({
                    directions: dir,
                    fitBounds: true
                }));
            }
        </script>
    </head>

Start & End Marker Customization