Add rail-symbol icon

icons/rail-symbol.json

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+{
+  "$schema": "../icon.schema.json",
+  "contributors": [
+    "danielbayley"
+  ],
+  "tags": [
+    "railway",
+    "train",
+    "track",
+    "line"
+  ],
+  "categories": [
+    "transportation"
+  ]
+}

icons/rail-symbol.svg

@@ -0,0 +1,15 @@
+<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="M5 15h14" />
+  <path d="M5 9h14" />
+  <path d="m14 20-5-5 6-6-5-5" />
+</svg>