Add train-track icon

icons/train-track.json

@@ -0,0 +1,13 @@
+{
+  "$schema": "../icon.schema.json",
+  "contributors": [
+    "danielbayley"
+  ],
+  "tags": [
+    "railway",
+    "line"
+  ],
+  "categories": [
+    "transportation"
+  ]
+}

icons/train-track.svg

@@ -0,0 +1,20 @@
+<svg
+  xmlns="http://www.w3.org/2000/svg"
+  width="24"
+  height="24"
+  viewBox="0 0 24 24"
+  fill="none"
+  stroke="currentColor"
+  stroke-width="2"
+  stroke-linecap="round"
+  stroke-linejoin="round"
+>
+  <path d="M2 19 19 2" />
+  <path d="m2.1 16.2 5.7 5.7" />
+  <path d="m4.9 13.4 5.7 5.7" />
+  <path d="m7.8 10.6 5.6 5.6" />
+  <path d="m10.6 7.8 5.6 5.6" />
+  <path d="m13.4 4.9 5.7 5.7" />
+  <path d="m16.2 2.1 5.7 5.7" />
+  <path d="M5 22 22 5" />
+</svg>