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-rw-r--r--newgrf_callbacks.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/newgrf_callbacks.h b/newgrf_callbacks.h
index bdbb0e359..9d0a7a3da 100644
--- a/newgrf_callbacks.h
+++ b/newgrf_callbacks.h
@@ -19,6 +19,10 @@ enum CallbackID {
// only for train vehicles
CBID_TRAIN_VEHICLE_LENGTH = 0x11,
+ /* Called to determine the amount of cargo to load per unit of time when
+ * using gradual loading. */
+ CBID_VEHICLE_LOAD_AMOUNT = 0x12,
+
/* Called (if appropriate bit in callback mask is set) to determine if a
* newstation should be made available to build */
CBID_STATION_AVAILABILITY = 0x13,