diff --git a/trans.h b/trans.h
new file mode 100644
index 0000000..0329541
--- /dev/null
+++ b/trans.h
@@ -0,0 +1,36 @@
+/* 
+ * File:   trans.h
+ * Author: cmosher
+ *
+ * Created on December 10, 2013, 2:37 PM
+ */
+
+#ifndef TRANS_H
+#define	TRANS_H
+
+#include <string>
+#include <vector>
+
+class Trans;
+
+class Segment {
+public:
+    std::string id;
+    std::vector<Trans*> gates;
+    std::vector<Trans*> c1c2s;
+
+    bool pullup;
+    bool pulldown;
+    bool on;
+};
+
+class Trans {
+public:
+    Segment* c1;
+    Segment* gate;
+    Segment* c2;
+
+    bool on;
+};
+
+#endif	/* TRANS_H */