diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index de4a9c76fb..e1ba368b77 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -215,7 +215,8 @@ static void dewagonize(int condition, int engine)
 
 	if (condition != 0) {
 		ei->unk2 &= ~0x80;
-		rvi->railveh_type = RAILVEH_SINGLEHEAD;
+		if (rvi->railveh_type == RAILVEH_WAGON)
+			rvi->railveh_type = RAILVEH_SINGLEHEAD;
 	} else {
 		ei->unk2 |= 0x80;
 		rvi->railveh_type = RAILVEH_WAGON;