diff --git a/McZapkie/MOVER.h b/McZapkie/MOVER.h
index 199c65a0c..79a73f1a0 100644
--- a/McZapkie/MOVER.h
+++ b/McZapkie/MOVER.h
@@ -2466,6 +2466,13 @@ class TMoverParameters
 	{
 		return false == StLinFlag && MainCircuitLampsEnabled();
 	}
+	// whether the cab command opening the main circuit opens it where the only cab switch of the circuit is the button
+	// closing it: on a diesel that's the starter button, and the command is the one way to stop an engine whose fuel pump
+	// starts on its own (eu07/maszyna#427). the other vehicles with such a button keep ignoring the command
+	bool MainCircuitOpensWithStarterOnly() const
+	{
+		return EngineType == TEngineType::DieselEngine || EngineType == TEngineType::DieselElectric;
+	}
 	// whether the pumps a joint oil and fuel pump switch works, those not started automatically, are all switched on
 	bool OilFuelPumpsEnabled() const
 	{
diff --git a/tests/unit/data/diesel_shunter.json b/tests/unit/data/diesel_shunter.json
new file mode 100644
index 000000000..3cbcdb992
--- /dev/null
+++ b/tests/unit/data/diesel_shunter.json
@@ -0,0 +1,53 @@
+{
+  "_comment": "Diesel shunter with a mechanical gearbox, made after the SM03 (Ls150): the fuel pump starts on its own with the engine, a converter run by the engine feeds the low voltage circuit, the only cab control of the engine is the starter button.",
+  "Param": { "Category": "train", "M": 23200, "Vmax": 25.68, "PWR": 111.855, "SandCap": 200 },
+  "Dimensions": { "L": 6.94, "H": 3.21, "W": 2.97, "Cx": 0.3 },
+  "Wheels": { "D": 0.94, "Tw": 1.435, "AIM": 250, "Axle": "B", "Ad": 2.5, "Bd": 2.5, "Rmin": 50, "BearingType": "Roll" },
+  "Brake": {
+    "BrakeValve": "K", "NBpA": 2, "MBF": 85.0, "MaxBP": 3.5, "LocMaxBP": 5.0, "BCN": 1, "BCR": 0.114, "BCD": 0.12, "BCM": 10.0,
+    "HiPP": 5, "LoPP": 3.5, "Vv": 0.3, "MinCP": 7.0, "MaxCP": 8.0, "CompressorSpeed": 0.0125, "CompressorPower": "Main",
+    "BCS": 0.8, "BSA": 0, "BM": "P10-Bg", "BVV": 40, "BRE": 0.9
+  },
+  "BuffCoupl": { "CType": "Screw", "kB": 9200, "DmaxB": 0.15, "FmaxB": 740, "kC": 4800, "DmaxC": 0.15, "FmaxC": 780, "beta": 0.58, "AllowedFlag": 3 },
+  "Cntrl": {
+    "BrakeSystem": "Pneumatic", "BDelay1": 15, "BDelay2": 4, "ASB": "Manual", "LocalBrake": "PneumaticBrake", "ManualBrake": "Yes",
+    "DynamicBrake": "Passive", "MCPN": 9, "SCPN": 7, "AutoRelay": "No", "IniCDelay": 0.5, "SCDelay": 0.1, "BrakeDelays": "P",
+    "BrakeHandle": "Knorr", "LocBrakeHandle": "Knorr", "FuelStart": "Automatic", "ConverterStart": "Automatic"
+  },
+  "Light": { "Light": "Generator", "LGeneratorEngine": "ElectricSeriesMotor", "LMaxVoltage": 24, "LMaxCurrent": 100 },
+  "Engine": {
+    "EngineType": "DieselEngine", "Trans": "1:1", "nmin": 900, "nmax": 1500, "nmax_cutoff": 1550, "AIM": 100,
+    "OilMinPressure": 0.343, "OilMaxPressure": 0.686, "WaterCoolingTemperature": 80, "WaterShutters": "yes", "WaterAuxCircuit": "no",
+    "HeatKFO": 160, "HeatKFO2": 180, "HeatKFS": 160, "HeatKFE": 7, "HeatKW": 2, "HeatKV": 0.3, "IsTC": "No", "EUS": 0.35, "EDS": 1.0
+  },
+  "_gears": "rows: gear, ratio, engagement speed, top speed; the even ones neutral",
+  "MotorParamTable": {
+    "minVelfullengage": 3.8, "engageDia": 1, "engageMaxForce": 800, "engagefriction": 1,
+    "rows": [
+      [0, 0, 0, -1],
+      [1, 46.88, -1, 5.73],
+      [2, 0, 0, -1],
+      [3, 28.65, 2.9, 9.42],
+      [4, 0, 0, -1],
+      [5, 17.12, 4.7, 15.69],
+      [6, 0, 0, -1],
+      [7, 10.46, 10.6, 100]
+    ]
+  },
+  "_throttle": "rows: position, fill, speed governor mode; position 0 idles",
+  "DList": {
+    "Size": 9, "Mmax": 784.5, "nMmax": 15, "Mnmax": 686.4, "nmax": 25, "nominalfill": 1, "Mstand": 200.0,
+    "rows": [
+      [0, 0.1, 0],
+      [1, 0.2, 2],
+      [2, 0.3, 2],
+      [3, 0.4, 2],
+      [4, 0.5, 2],
+      [5, 0.6, 2],
+      [6, 0.7, 2],
+      [7, 0.8, 2],
+      [8, 0.9, 2],
+      [9, 1.0, 2]
+    ]
+  }
+}
diff --git a/tests/unit/test_engine_shutdown.cpp b/tests/unit/test_engine_shutdown.cpp
new file mode 100644
index 000000000..9230330f4
--- /dev/null
+++ b/tests/unit/test_engine_shutdown.cpp
@@ -0,0 +1,74 @@
+#include "stdafx.h"
+#include "doctest.h"
+#include "vehicle.h"
+
+// stopping the engine of a diesel shunter like the SM03 (eu07/maszyna#427): its fuel pump starts on its own with the
+// engine and the engine runs the converter which feeds the low voltage circuit, so neither the fuel pump switch nor the
+// battery switch stop it. the cab has only the starter button, and the command opening the main circuit has to stop it
+
+namespace {
+
+// the shunter with its engine started from the cab and idling
+test::vehicle running_shunter() {
+	test::vehicle shunter{test::definition::load("diesel_shunter")};
+	shunter->CabOccupied = 1;
+	shunter->CabActivisation();
+	shunter->BatterySwitch(true);
+	shunter->OilPumpSwitch(true);
+	shunter.run(20.0); // the oil pressure builds up
+	shunter->MainSwitch(true);
+	shunter.run(15.0);
+	return shunter;
+}
+
+} // namespace
+
+TEST_CASE("engine shutdown: the shunter starts with the starter button") {
+	auto shunter{running_shunter()};
+	REQUIRE(shunter->EngineType == TEngineType::DieselEngine);
+	REQUIRE(shunter->FuelPump.start_type == start_t::automatic);
+	CHECK(shunter->Mains);
+	CHECK(shunter->FuelPump.is_active);
+	CHECK(shunter->enrot > 0.9 * shunter->dizel_nmin);
+}
+
+TEST_CASE("engine shutdown: neither the fuel pump switch nor the battery switch stop the engine") {
+	auto shunter{running_shunter()};
+	shunter->FuelPumpSwitchOff(true, range_t::local); // the pump started automatically ignores its switch
+	shunter.run(10.0);
+	CHECK(shunter->Mains);
+	shunter->BatterySwitch(false);
+	shunter.run(10.0);
+	CHECK(shunter->Power110vIsAvailable); // the converter run by the engine keeps feeding the fuel pump
+	CHECK(shunter->Mains);
+	CHECK(shunter->enrot > 0.9 * shunter->dizel_nmin);
+}
+
+TEST_CASE("engine shutdown: the command opening the main circuit stops the engine and it stays stopped") {
+	auto shunter{running_shunter()};
+	REQUIRE(shunter->MainCircuitOpensWithStarterOnly()); // the cab passes the command on with only the starter button
+	CHECK(shunter->MainSwitch(false));
+	shunter.run(20.0);
+	CHECK_FALSE(shunter->Mains);
+	CHECK_FALSE(shunter->FuelPump.is_active);
+	CHECK(shunter->enrot == 0.0);
+}
+
+TEST_CASE("engine shutdown: the engine starts again after it was stopped") {
+	auto shunter{running_shunter()};
+	shunter->MainSwitch(false);
+	shunter.run(20.0);
+	REQUIRE(shunter->enrot == 0.0);
+	shunter->MainSwitch(true);
+	shunter.run(15.0);
+	CHECK(shunter->Mains);
+	CHECK(shunter->enrot > 0.9 * shunter->dizel_nmin);
+}
+
+TEST_CASE("engine shutdown: vehicles without a diesel keep ignoring the command with only the button closing the circuit") {
+	test::vehicle wagon{test::definition::load("wagon")};
+	CHECK_FALSE(wagon->MainCircuitOpensWithStarterOnly());
+	test::vehicle electric{test::definition::load("wagon").set("Engine", "EngineType", "ElectricSeriesMotor")};
+	REQUIRE(electric->EngineType == TEngineType::ElectricSeriesMotor);
+	CHECK_FALSE(electric->MainCircuitOpensWithStarterOnly());
+}
diff --git a/vehicle/Train.cpp b/vehicle/Train.cpp
index 201b8972f..1b7d06a8f 100644
--- a/vehicle/Train.cpp
+++ b/vehicle/Train.cpp
@@ -3702,13 +3702,14 @@ void TTrain::OnCommand_linebreakeropen(TTrain *Train, command_data const &Comman
 		{
 			Train->ggMainButton.UpdateValue(0.0, Train->dsbSwitch);
 		}
-		else if (Train->ggMainOnButton.SubModel != nullptr)
+		else if (Train->ggMainOnButton.SubModel != nullptr && false == Train->mvControlled->MainCircuitOpensWithStarterOnly())
 		{
 			// NOTE: legacy behaviour, for vehicles equipped only with impulse close switch
 			// it doesn't make any real sense to animate this one, but some people can't get over how there's no visual reaction to their keypress
 			Train->ggMainOnButton.UpdateValue(1.0, Train->dsbSwitch);
 			return;
 		}
+		// a diesel with only the starter button gets its engine stopped. the button stays put: held down, it would start the engine again
 		// play sound immediately when the switch is hit, not after release
 		Train->fMainRelayTimer = 0.0f;