diff --git a/src/rail.c b/src/rail.c
index bd21bb6..bd8d8a1 100644
--- a/src/rail.c
+++ b/src/rail.c
@@ -39,4 +39,27 @@ rail_node_t *CreateRails(int length, int node_num)
     head->last_node = node;
 
     return head;
-}
\ No newline at end of file
+}
+
+rail_node_t *FindNode(rail_node_t *rails, int id)
+{
+    rail_node_t *p = NULL;
+    if(rails)
+    {
+        if(rails->id == id)
+        {
+            return rails;
+        }
+        if(rails->next_node != NULL)
+        {
+            p = FindNode(rails->next_node, id);
+            if(p) 
+            {
+                return p;
+            }
+        }
+        
+    }
+    return NULL;
+}
+