Adds rail padding variations

src/definitions/elements/rail.less

@@ -61,8 +61,29 @@
   border-left: @dividedBorder;
   padding: 0em 0em 0em (@dividedDistance / 2);
   margin: 0em 0em 0em (@dividedDistance / 2);
+}
+
+/*--------------
+    Distance
+---------------*/
 
+.ui.close.left.rail {
+  padding: 0em (@closeDistance / 2) 0em 0em;
+  margin: 0em (@closeDistance / 2) 0em 0em;
 }
+.ui.close.right.rail {
+  padding: 0em 0em 0em (@closeDistance / 2);
+  margin: 0em 0em 0em (@closeDistance / 2);
+}
+.ui.very.close.left.rail {
+  padding: 0em (@veryCloseDistance / 2) 0em 0em;
+  margin: 0em (@veryCloseDistance / 2) 0em 0em;
+}
+.ui.very.close.right.rail {
+  padding: 0em 0em 0em (@veryCloseDistance / 2);
+  margin: 0em 0em 0em (@veryCloseDistance / 2);
+}
+
 
 /*--------------
      Sizing

src/themes/packages/default/elements/rail.variables

@@ -15,5 +15,10 @@
       Variations
 --------------------*/
 
+/* Close */
+@closeDistance: 2em;
+@veryCloseDistance: 1em;
+
+/* Divided */
 @dividedBorder: 1px solid @borderColor;
 @dividedDistance: 5rem;