added locomotive + family waggons icons

icons/steam-locomotive.svg

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   width="48"
+   height="48"
+   viewBox="0 0 48 48"
+   fill="none"
+   version="1.1"
+   id="svg1"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs1" />
+  <path
+     fill-rule="evenodd"
+     clip-rule="evenodd"
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+     id="path1"
+     style="stroke-width:1.60029" />
+</svg>