diff --git a/src/newgrf.cpp b/src/newgrf.cpp
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -1319,6 +1319,10 @@ static ChangeInfoResult RoadVehicleChang
 				ei->cargo_age_period = buf->ReadWord();
 				break;
 
+			case 0x23: // Shorter vehicle
+				rvi->shorten_factor = buf->ReadByte();
+				break;
+
 			default:
 				ret = CommonVehicleChangeInfo(ei, prop, buf);
 				break;