OpenRailwayMap extra layer from OpenStreetMap.de

orm-de-layer.user.js

// ==UserScript==
// @name         Add OpenStreetMap.de Layer to OpenRailwayMap
// @namespace    http://tampermonkey.net/
// @version      0.3
// @description  try to take over the world!
// @author       Felix De Montis
// @match        https://*.openrailwaymap.org/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    window.cfc = setInterval(checkForControls, 50);

    function checkForControls() {
        var functionDefined = window.hasOwnProperty('setupControls');

        console.log('SC', functionDefined)

        if (functionDefined) {
            clearInterval(window.cfc);
            console.log(setupControls);
            window.setupControls = newSetupControls;
            console.log(setupControls);
        }
    }

    function newSetupControls() {
        // grayscale mapnik background layer
        var mapnikGray = new L.TileLayer.Grayscale('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
                                                   {
            attribution: _("Map data © OpenStreetMap contributors"),
            maxZoom: 19
        }).addTo(map);
        // normal mapnik background layer
        var mapnik = new L.TileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
                                     {
            attribution: _("Map data © OpenStreetMap contributors"),
            maxZoom: 19
        });

        // blank background map
        var blank = new L.TileLayer(window.openrailwaymap.root+'/img/blank.png',
                                    {
            maxZoom: 20
        });

        var deLayer = new L.TileLayer("https://{s}.tile.openstreetmap.de/{z}/{x}/{y}.png", {
            maxZoom: 20
        })

        var deLayerGray = new L.TileLayer.Grayscale("https://{s}.tile.openstreetmap.de/{z}/{x}/{y}.png", {
            maxZoom: 20
        })


        var baseLayers = new Object();
        baseLayers[_("Mapnik")] = mapnik;
        baseLayers[_("Mapnik Grayscale")] = mapnikGray;
        baseLayers[_("No background map")] = blank;
        baseLayers[_("OSM DE")] = deLayer;
        baseLayers[_("OSM DE Grayscake")] = deLayerGray;

        // hillshading layer
        var hillshading = new L.TileLayer('http://{s}.tiles.wmflabs.org/hillshading/{z}/{x}/{y}.png',
                                          {
            attribution: _("Hillshading by <a href='https://www.nasa.gov/'>NASA SRTM</a>"),
            maxZoom: 17
        });

        var overlays = new Object();
        overlays[_("Hillshading")] = hillshading;
        overlays[_("OpenRailwayMap")] = railmap;

        new L.Control.Scale({metric:true, maxWidth:200}).addTo(map);
        new L.Control.Layers(baseLayers, overlays).addTo(map);
    }

})();