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+% RWT_ADD(3ADVTRAINS) | Advtrains Developer's Manual
+
+# NAME
+`add`, `diff`, `sub` - Add or subtract railway time objects
+
+# SYNOPSIS
+
+* `add(t1, t2)`
+* `diff(t1, t2)`
+* `sub(t1, t2)`
+
+# DESCRIPTION
+
+* `add()` returns the result of adding `t1` and `t2`.
+* `diff()` returns the result of subtracting `t1` from `t2`.
+* `sub()` returns the result of subtracting `t2` from `t1`.
+
+# RETURN VALUE
+
+`add()` and `sub()` return their results as tables. `diff()` returns its result as a number.