diff --git a/src/train_cmd.cpp b/src/train_cmd.cpp
--- a/src/train_cmd.cpp
+++ b/src/train_cmd.cpp
@@ -1936,6 +1936,7 @@ CommandCost CmdReverseTrainDirection(DoC
 		}
 	} else {
 		/* turn the whole train around */
+		if (!v->IsPrimaryVehicle()) return CMD_ERROR;
 		if ((v->vehstatus & VS_CRASHED) || v->breakdown_ctr != 0) return CMD_ERROR;
 
 		if (flags & DC_EXEC) {