diff --git a/src/train_cmd.cpp b/src/train_cmd.cpp
index 593ac3f692..9be6b86606 100644
--- a/src/train_cmd.cpp
+++ b/src/train_cmd.cpp
@@ -349,6 +349,9 @@ void Train::ConsistChanged(ConsistChangeFlags allowed_changes)
 		InvalidateWindowData(WC_VEHICLE_REFIT, this->index, VIWD_CONSIST_CHANGED);
 		InvalidateWindowData(WC_VEHICLE_ORDERS, this->index, VIWD_CONSIST_CHANGED);
 		InvalidateNewGRFInspectWindow(GSF_TRAINS, this->index);
+	} else {
+		this->tcache.cached_deceleration = 0;
+		this->tcache.cached_uncapped_decel = 0;
 	}
 	if (allowed_changes & CCF_LENGTH) {
 		for (Train *u = this->Next(); u != nullptr; u = u->Next()) {