diff --git a/src/ai/api/ai_engine.cpp b/src/ai/api/ai_engine.cpp
new file mode 100644
--- /dev/null
+++ b/src/ai/api/ai_engine.cpp
@@ -0,0 +1,295 @@
+/* $Id$ */
+
+/** @file ai_engine.cpp Implementation of AIEngine. */
+
+#include "ai_engine.hpp"
+#include "ai_cargo.hpp"
+#include "ai_rail.hpp"
+#include "../../openttd.h"
+#include "../../company_func.h"
+#include "../../strings_func.h"
+#include "../../roadveh.h"
+#include "../../train.h"
+#include "../../ship.h"
+#include "../../aircraft.h"
+#include "../../vehicle_func.h"
+#include "../../core/alloc_func.hpp"
+#include "../../economy_func.h"
+#include "../../core/bitmath_func.hpp"
+#include "../../settings_type.h"
+#include "../../articulated_vehicles.h"
+#include "table/strings.h"
+
+/* static */ bool AIEngine::IsValidEngine(EngineID engine_id)
+{
+	return ::IsEngineIndex(engine_id) && HasBit(::GetEngine(engine_id)->company_avail, _current_company);
+}
+
+/* static */ const char *AIEngine::GetName(EngineID engine_id)
+{
+	if (!IsValidEngine(engine_id)) return NULL;
+
+	static const int len = 64;
+	char *engine_name = MallocT<char>(len);
+
+	::SetDParam(0, engine_id);
+	::GetString(engine_name, STR_ENGINE_NAME, &engine_name[len - 1]);
+	return engine_name;
+}
+
+/* static */ CargoID AIEngine::GetCargoType(EngineID engine_id)
+{
+	if (!IsValidEngine(engine_id)) return CT_INVALID;
+
+	switch (::GetEngine(engine_id)->type) {
+		case VEH_ROAD: {
+			const RoadVehicleInfo *vi = ::RoadVehInfo(engine_id);
+			return vi->cargo_type;
+		} break;
+
+		case VEH_TRAIN: {
+			const RailVehicleInfo *vi = ::RailVehInfo(engine_id);
+			return vi->cargo_type;
+		} break;
+
+		case VEH_SHIP: {
+			const ShipVehicleInfo *vi = ::ShipVehInfo(engine_id);
+			return vi->cargo_type;
+		} break;
+
+		case VEH_AIRCRAFT: {
+			return CT_PASSENGERS;
+		} break;
+
+		default: NOT_REACHED();
+	}
+}
+
+/* static */ bool AIEngine::CanRefitCargo(EngineID engine_id, CargoID cargo_id)
+{
+	if (!IsValidEngine(engine_id)) return false;
+	if (!AICargo::IsValidCargo(cargo_id)) return false;
+
+	if (GetCargoType(engine_id) == cargo_id) return true;
+	if (cargo_id == CT_MAIL && ::GetEngine(engine_id)->type == VEH_AIRCRAFT) return true;
+	if (::GetEngine(engine_id)->type == VEH_SHIP && !ShipVehInfo(engine_id)->refittable) return false;
+	return ::CanRefitTo(engine_id, cargo_id);
+}
+
+/* static */ bool AIEngine::CanPullCargo(EngineID engine_id, CargoID cargo_id)
+{
+	if (!IsValidEngine(engine_id)) return false;
+	if (GetVehicleType(engine_id) != AIVehicle::VEHICLE_RAIL) return false;
+	if (!AICargo::IsValidCargo(cargo_id)) return false;
+
+	return (::RailVehInfo(engine_id)->ai_passenger_only != 1) || AICargo::HasCargoClass(cargo_id, AICargo::CC_PASSENGERS);
+}
+
+
+/* static */ int32 AIEngine::GetCapacity(EngineID engine_id)
+{
+	if (!IsValidEngine(engine_id)) return -1;
+
+	switch (::GetEngine(engine_id)->type) {
+		case VEH_ROAD:
+		case VEH_TRAIN: {
+			uint16 *capacities = GetCapacityOfArticulatedParts(engine_id, ::GetEngine(engine_id)->type);
+			for (CargoID c = 0; c < NUM_CARGO; c++) {
+				if (capacities[c] == 0) continue;
+				return capacities[c];
+			}
+			return -1;
+		} break;
+
+		case VEH_SHIP: {
+			const ShipVehicleInfo *vi = ::ShipVehInfo(engine_id);
+			return vi->capacity;
+		} break;
+
+		case VEH_AIRCRAFT: {
+			const AircraftVehicleInfo *vi = ::AircraftVehInfo(engine_id);
+			return vi->passenger_capacity;
+		} break;
+
+		default: NOT_REACHED();
+	}
+}
+
+/* static */ int32 AIEngine::GetReliability(EngineID engine_id)
+{
+	if (!IsValidEngine(engine_id)) return -1;
+
+	return (::GetEngine(engine_id)->reliability * 100 >> 16);
+}
+
+/* static */ int32 AIEngine::GetMaxSpeed(EngineID engine_id)
+{
+	if (!IsValidEngine(engine_id)) return -1;
+
+	switch (::GetEngine(engine_id)->type) {
+		case VEH_ROAD: {
+			const RoadVehicleInfo *vi = ::RoadVehInfo(engine_id);
+			/* Internal speeds are km/h * 2 */
+			return vi->max_speed / 2;
+		} break;
+
+		case VEH_TRAIN: {
+			const RailVehicleInfo *vi = ::RailVehInfo(engine_id);
+			return vi->max_speed;
+		} break;
+
+		case VEH_SHIP: {
+			const ShipVehicleInfo *vi = ::ShipVehInfo(engine_id);
+			/* Internal speeds are km/h * 2 */
+			return vi->max_speed / 2;
+		} break;
+
+		case VEH_AIRCRAFT: {
+			const AircraftVehicleInfo *vi = ::AircraftVehInfo(engine_id);
+			return vi->max_speed / _settings_game.vehicle.plane_speed;
+		} break;
+
+		default: NOT_REACHED();
+	}
+}
+
+/* static */ Money AIEngine::GetPrice(EngineID engine_id)
+{
+	if (!IsValidEngine(engine_id)) return -1;
+
+	switch (::GetEngine(engine_id)->type) {
+		case VEH_ROAD: {
+			const RoadVehicleInfo *vi = ::RoadVehInfo(engine_id);
+			return (_price.roadveh_base >> 3) * vi->cost_factor >> 5;
+		} break;
+
+		case VEH_TRAIN: {
+			const RailVehicleInfo *vi = ::RailVehInfo(engine_id);
+			return (_price.build_railvehicle >> 3) * vi->cost_factor >> 5;
+		} break;
+
+		case VEH_SHIP: {
+			const ShipVehicleInfo *vi = ::ShipVehInfo(engine_id);
+			return (_price.ship_base >> 3) * vi->cost_factor >> 5;
+		} break;
+
+		case VEH_AIRCRAFT: {
+			const AircraftVehicleInfo *vi = ::AircraftVehInfo(engine_id);
+			return (_price.aircraft_base >> 3) * vi->cost_factor >> 5;
+		} break;
+
+		default: NOT_REACHED();
+	}
+}
+
+/* static */ int32 AIEngine::GetMaxAge(EngineID engine_id)
+{
+	if (!IsValidEngine(engine_id)) return -1;
+
+	return ::GetEngine(engine_id)->lifelength * 366;
+}
+
+/* static */ Money AIEngine::GetRunningCost(EngineID engine_id)
+{
+	if (!IsValidEngine(engine_id)) return -1;
+
+	/* We need to create an instance in order to obtain GetRunningCost.
+	 *  This means we temporary allocate a vehicle in the pool, but
+	 *  there is no other way.. */
+	Vehicle *vehicle;
+	switch (::GetEngine(engine_id)->type) {
+		case VEH_ROAD: {
+			vehicle = new RoadVehicle();
+		} break;
+
+		case VEH_TRAIN: {
+			vehicle = new Train();
+		} break;
+
+		case VEH_SHIP: {
+			vehicle = new Ship();
+		} break;
+
+		case VEH_AIRCRAFT: {
+			vehicle = new Aircraft();
+		} break;
+
+		default: NOT_REACHED();
+	}
+
+	vehicle->engine_type = engine_id;
+	Money runningCost = vehicle->GetRunningCost();
+	delete vehicle;
+	return runningCost >> 8;
+}
+
+/* static */ AIVehicle::VehicleType AIEngine::GetVehicleType(EngineID engine_id)
+{
+	if (!IsValidEngine(engine_id)) return AIVehicle::VEHICLE_INVALID;
+
+	switch (::GetEngine(engine_id)->type) {
+		case VEH_ROAD:     return AIVehicle::VEHICLE_ROAD;
+		case VEH_TRAIN:    return AIVehicle::VEHICLE_RAIL;
+		case VEH_SHIP:     return AIVehicle::VEHICLE_WATER;
+		case VEH_AIRCRAFT: return AIVehicle::VEHICLE_AIR;
+		default: NOT_REACHED();
+	}
+}
+
+/* static */ bool AIEngine::IsWagon(EngineID engine_id)
+{
+	if (!IsValidEngine(engine_id)) return false;
+	if (GetVehicleType(engine_id) != AIVehicle::VEHICLE_RAIL) return false;
+
+	return ::RailVehInfo(engine_id)->power == 0;
+}
+
+/* static */ bool AIEngine::CanRunOnRail(EngineID engine_id, AIRail::RailType track_rail_type)
+{
+	if (!IsValidEngine(engine_id)) return false;
+	if (GetVehicleType(engine_id) != AIVehicle::VEHICLE_RAIL) return false;
+	if (!AIRail::IsRailTypeAvailable(track_rail_type)) return false;
+
+	return ::IsCompatibleRail((::RailType)::RailVehInfo(engine_id)->railtype, (::RailType)track_rail_type);
+}
+
+/* static */ bool AIEngine::HasPowerOnRail(EngineID engine_id, AIRail::RailType track_rail_type)
+{
+	if (!IsValidEngine(engine_id)) return false;
+	if (GetVehicleType(engine_id) != AIVehicle::VEHICLE_RAIL) return false;
+	if (!AIRail::IsRailTypeAvailable(track_rail_type)) return false;
+
+	return ::HasPowerOnRail((::RailType)::RailVehInfo(engine_id)->railtype, (::RailType)track_rail_type);
+}
+
+/* static */ AIRoad::RoadType AIEngine::GetRoadType(EngineID engine_id)
+{
+	if (!IsValidEngine(engine_id)) return AIRoad::ROADTYPE_INVALID;
+	if (GetVehicleType(engine_id) != AIVehicle::VEHICLE_ROAD) return AIRoad::ROADTYPE_INVALID;
+
+	return HasBit(::EngInfo(engine_id)->misc_flags, EF_ROAD_TRAM) ? AIRoad::ROADTYPE_TRAM : AIRoad::ROADTYPE_ROAD;
+}
+
+/* static */ AIRail::RailType AIEngine::GetRailType(EngineID engine_id)
+{
+	if (!IsValidEngine(engine_id)) return AIRail::RAILTYPE_INVALID;
+	if (GetVehicleType(engine_id) != AIVehicle::VEHICLE_RAIL) return AIRail::RAILTYPE_INVALID;
+
+	return (AIRail::RailType)(uint)::RailVehInfo(engine_id)->railtype;
+}
+
+/* static */ bool AIEngine::IsArticulated(EngineID engine_id)
+{
+	if (!IsValidEngine(engine_id)) return false;
+	if (GetVehicleType(engine_id) != AIVehicle::VEHICLE_ROAD && GetVehicleType(engine_id) != AIVehicle::VEHICLE_RAIL) return false;
+
+	return CountArticulatedParts(engine_id, true) != 0;
+}
+
+/* static */ AIAirport::PlaneType AIEngine::GetPlaneType(EngineID engine_id)
+{
+	if (!IsValidEngine(engine_id)) return AIAirport::PT_INVALID;
+	if (GetVehicleType(engine_id) != AIVehicle::VEHICLE_AIR) return AIAirport::PT_INVALID;
+
+	return (AIAirport::PlaneType)::AircraftVehInfo(engine_id)->subtype;
+}