Index: trunk/resources/data/validator/geometry.mapcss
===================================================================
--- trunk/resources/data/validator/geometry.mapcss	(revision 19162)
+++ trunk/resources/data/validator/geometry.mapcss	(revision 19163)
@@ -283,6 +283,4 @@
 node:unconnected:in-downloaded-area[railway=level_crossing],
 node:unconnected:in-downloaded-area[railway=milestone],
-node:unconnected:in-downloaded-area[railway=railway_crossing],
-node:unconnected:in-downloaded-area[railway=switch],
 node:unconnected:in-downloaded-area[public_transport=stop_position],
 node:unconnected:in-downloaded-area[aeroway=holding_position],
@@ -425,2 +423,17 @@
   throwWarning: tr("Ferry route is not connected to a ferry terminal or branches.");
 }
+
+/* #21801 */
+way[railway][railway !~ /^(turntable|traverser|roundhouse|workshop|platform)$/] > node[/railway$/ !~ /^(switch|railway_crossing)$/][count(parent_osm_primitives("railway")) > 2]:connection,
+way[railway][railway !~ /^(turntable|traverser|roundhouse|workshop|platform)$/] >[index!=1][index!=-1] node[/railway$/ !~ /^(switch|railway_crossing)$/][count(parent_osm_primitives("railway")) == 2]:connection {
+  set missing_switch_railway_crossing;
+}
+node.missing_switch_railway_crossing {
+  throwWarning: tr("Railways connection node without {0} or {1}", "railway=switch", "railway=railway_crossing");
+  group: tr("missing tag");
+}
+node[railway=railway_crossing]!:connection:in-downloaded-area,
+node[railway=switch]!:connection:in-downloaded-area {
+  throwWarning: tr("{0}", "{0.tag}");
+  group: tr("Node should be connected to two or more ways");
+}