diff -r 13e73691378a -r b18d1d5b047d src/ai/api/ai_vehicle.cpp
--- a/src/ai/api/ai_vehicle.cpp	Tue Apr 15 15:05:30 2008 +0000
+++ b/src/ai/api/ai_vehicle.cpp	Tue Apr 15 15:32:47 2008 +0000
@@ -227,3 +227,28 @@
 	}
 }
 
+/* static */ int32 AIVehicle::GetCapacity(VehicleID vehicle_id, CargoID cargo)
+{
+	if (!IsValidVehicle(vehicle_id)) return -1;
+	if (!AICargo::IsValidCargo(cargo)) return -1;
+
+	uint32 amount = 0;
+	for (const Vehicle *v = ::GetVehicle(vehicle_id); v != NULL; v = v->Next()) {
+		if (v->cargo_type == cargo) amount += v->cargo_cap;
+	}
+
+	return amount;
+}
+
+/* static */ int32 AIVehicle::GetCargoLoad(VehicleID vehicle_id, CargoID cargo)
+{
+	if (!IsValidVehicle(vehicle_id)) return -1;
+	if (!AICargo::IsValidCargo(cargo)) return -1;
+
+	uint32 amount = 0;
+	for (const Vehicle *v = ::GetVehicle(vehicle_id); v != NULL; v = v->Next()) {
+		if (v->cargo_type == cargo) amount += v->cargo.Count();
+	}
+
+	return amount;
+}