Make the train output point urgent

In order to avoid staying at this point.

Actually, it probably does not affect the staravation issue.
But still, it is more consistent this way.

ds/trains0.xml

@@ -24,6 +24,7 @@ chan        accesAB[NAB], accesBA[NBA], libAB[NAB], libBA[NBA], requestAB[NAB],
 		<declaration>clock x;</declaration>
 		<location id="id0" x="-51" y="0">
 			<name x="-51" y="17">A</name>
+			<urgent/>
 		</location>
 		<location id="id1" x="93" y="0">
 			<name x="84" y="17">BA</name>
@@ -69,6 +70,7 @@ chan        accesAB[NAB], accesBA[NBA], libAB[NAB], libBA[NBA], requestAB[NAB],
 		</location>
 		<location id="id6" x="127" y="229">
 			<name x="124" y="243">B</name>
+			<urgent/>
 		</location>
 		<location id="id7" x="280" y="229">
 			<name x="270" y="243">AB</name>