Add amtrak train live location layer

layers/amtrak-live/layer.js

@@ -0,0 +1,39 @@
+import VectorLayer from 'ol/layer/Vector';
+import {Vector as VectorSource} from 'ol/source.js';
+
+import {Style} from 'ol/style.js';
+import Icon from 'ol/style/Icon.js';
+
+import pinURL from './pin.svg?url';
+import { Feature } from 'ol';
+import { Point } from 'ol/geom';
+import { fromLonLat } from 'ol/proj';
+
+const vectorLayer = new VectorLayer({
+    source: new VectorSource({
+      loader: async function() {
+        const res = await fetch("https://api-v3.amtraker.com/v3/trains");
+        const trainsByRoute = await res.json();
+
+        for (let [_route, trains] of Object.entries(trainsByRoute)) {
+          for (let train of trains) {
+            const {stations: _, ...trainWithoutStations} = train;
+            this.addFeature(new Feature({
+              geometry: new Point(fromLonLat([train.lon, train.lat])),
+              ...trainWithoutStations,
+            }))
+          }
+        }
+      },
+    }),
+    style: new Style({
+        image: new Icon({
+            anchor: [0.5, .9],
+            src: pinURL,
+        }),
+    }),
+});
+
+setInterval(() => vectorLayer.getSource().refresh(), 30000);
+
+export default vectorLayer;