Key takeaways
- The type code is easy to read: number equals engine power in hp, letter equals number of coupled axles.
- D means four coupled axles in a rigid frame, not two bogies.
- Shunting locomotives need two brake systems: the continuous air brake and an independent parking brake.
- Brake markings are shown on the vehicle and make for a well-photographed documentation detail.
- Keeper, livery and location change constantly – always check the current situation.
Contents
Fact file
| Vehicle type | Diesel locomotive for shunting and transfer service |
|---|---|
| Manufacturer | Maschinenbau Kiel (MaK) |
| Type code | Number = engine power in hp, letter = number of coupled axles |
| Wheel arrangement | D – four coupled axles in a rigid frame |
| UIC type code | 98 (diesel shunting and light locomotive) |
Identifying features
Is this really the class in front of you?
- Four axles in a rigid frame, linked to one another by coupling rods
- Air reservoirs and brake linkage visible beneath the frame
- Brake markings and inspection dates in the data panel on the side wall
- A handbrake wheel or spindle in or on the cab
- Builder's plate reads MaK or Maschinenbau Kiel
- Setting: industrial, port and siding railways, heavy transfers
Updated: August 2026 – A shunting locomotive doesn’t need to run fast, but it does need to come to a reliable stop – with hundreds of tonnes behind it, in a confined space, often propelled from behind. The MaK 600 D carries several brake systems for exactly that reason. This page explains how they work together and which traces of that are visible on the vehicle.
Read the data panel? Then log it.
Brake markings, inspection dates and keeper markings turn a photo into a reliable sighting.
What is the MaK 600 D?
The MaK 600 D is a four-axle diesel locomotive for shunting and transfer service from the type programme of Maschinenbau Kiel. The type code follows the firm’s familiar logic: the number denotes the engine power in horsepower, the letter D the four coupled driving axles in the rigid frame. The Kiel type programme was later continued by Vossloh, which is why closely related machines carry different builder’s plates depending on their year of build.
Within the UIC type codes it sits under 98 for diesel shunting and light locomotives. That’s not a statement about size but an operational one: vehicles in this group form trains and move wagons, while diesel main-line locomotives with code 92 haul trains along the line. It’s precisely from this that the requirements for the brake equipment follow.
The brake systems of a shunting locomotive
Unlike a road vehicle, a locomotive has several mutually independent brakes that perform different jobs.
Continuous air brake
It acts on the whole train. If the pressure in the main air pipe drops, the brakes apply – even unintentionally, for example in the event of pipe damage. This fail-safe behaviour is its core safety principle.
Direct locomotive brake
It brakes only the traction vehicle and allows sensitive manoeuvring when setting wagons in place, without applying the train brake.
Parking brake
Mechanical, via handwheel or spindle, independent of the air supply. It secures a parked vehicle permanently once the air has bled away.
Sanding equipment as a supplement
Not a brake system, but closely related: sand improves the friction between wheel and rail and thereby helps both starting and braking. The sandboxes usually sit on the frame above the axles.
On the vehicle you mainly see the air reservoirs and brake linkage beneath the frame, the brake hoses at the vehicle ends, the handbrake wheel and the brake markings in the data panel. How to work through such details systematically is described in the guide to identifying rolling-stock classes.
The data panel is the data source on the vehicle
Brake type, brake weights, inspection date and keeper markings are gathered together there on the side wall. A sharp telephoto shot of this panel is often more valuable for later evaluation than the overall picture.
Where it fits in railway operations
Why a shunting locomotive needs several brake systems becomes clear from the typical operating situations.
| Operating situation | Brake in effect | Why |
|---|---|---|
| Running with an attached group of wagons | continuous air brake | brakes all vehicles simultaneously and automatically |
| Setting individual wagons in place | direct locomotive brake | sensitive stopping without applying the train brake |
| Parked overnight | parking brake | holds even once the air has bled away |
| Starting off with a heavy load | sanding equipment as support | improves friction between wheel and rail |
| Emergency or train division | emergency brake application via pressure drop | acts automatically without staff intervention |
Document the technical details too
Brake markings, works number and keeper in one sighting – that's what turns an archive into more than a picture collection.
Comparable four-axle machines in the MaK programme are the MaK 650 D and the more powerful MaK 1200 D. How another manufacturer approached the same task is shown by the Henschel DH 440.
Spotting and safety
Shunting locomotives work where people walk between vehicles and wagons are moved without warning. For observers that means the most interesting activity happens at the most dangerous spot – which is why keeping your distance is basic equipment.
Safe vantage points are public bridges over industrial tracks, level crossings on the siding line and footpaths alongside the railway installations. A telephoto lens replaces any need to get closer. Which distances apply and why they’re stricter in shunting areas is explained in the article on the safe distance from the track; how to observe shunting operations methodically is shown by the guide to spotting at a marshalling yard.
Braking distances are longer than they look
Even at walking pace, a heavy group of wagons needs several vehicle lengths to come to a stop. Shunting movements happen propelled from behind, without a signal and without warning. Industrial, port and siding railways are private property – don't enter track areas and observe only from publicly accessible land.
Deadlines and inspections: what that means for sightings
Rail vehicles are subject to recurring inspections. For spotters that’s more than administrative trivia, because deadlines determine whether a vehicle runs, stands, or is on its way to withdrawal – and they’re marked on the vehicle itself.
You’ll usually find the date of the last inspection in the data panel. From it you can gauge roughly how much longer a vehicle is likely to stay in service. If a deadline is approaching, it’s the keeper’s call: overhaul, withdrawal or sale. Especially for older industrial locomotives, this is often the moment a vehicle disappears from everyday operation.
Three things follow from this in practice. First, it’s worth logging the inspection date too – it places a sighting in time and later explains why a vehicle suddenly stopped turning up. Second, vehicles nearing the end of an inspection deadline are especially interesting, because they may not return afterwards. Third, this deadline cycle explains why fleet lists go out of date so quickly: between two editions of the same list, a substantial share of the fleet can have changed status.
The same applies to rebuilds. Re-engining, new cab windows, retrofitted warning equipment or exhaust treatment change the appearance without touching the identity. Anyone who sorts purely by looks loses track of the vehicle at exactly this point.
What remains reliable is the combination of works number and documented date. How to log both together with location and condition in a structured way is described in the guide to the sighting log – for industrial locomotives, that’s not busywork but the only route to a reliable record.
Common mix-ups
It points to a four-axle MaK if …
- you count four axles in a line in the rigid frame
- coupling rods run between the axles
- the builder's plate reads MaK or Maschinenbau Kiel
- an existing vehicle number begins with 98
Look more closely if …
- the vehicle has been re-engined or rebuilt
- cladding hides the running gear and brake linkage
- you only see the vehicle from the front
It is not a 600 D if …
- the vehicle has bogies
- you count two or three axles
- the vehicle number begins with 92 – then it is a main-line locomotive
Conclusion
One final point that’s often overlooked: brake technology is also the reason behind many seemingly unmotivated standing times in shunting service. When a locomotive stands still with a group of wagons attached for several minutes, a brake test is usually under way. Knowing that makes for more patient waiting, and also shows that a stationary shunting move is by no means finished – it can set off again at any moment.
The MaK 600 D illustrates why shunting locomotives are technically self-contained vehicles. Four coupled axles supply the adhesion weight, several independent brake systems make the operation controllable, and the data panel documents both for anyone to read. For identification, the number of axles, type markings and builder’s plate are enough – everything else on the vehicle is subject to change.
In short
Four coupled axles, rod drive, several brake systems: the MaK 600 D is a typical shunting locomotive of type code 98. The data panel on the side wall is the richest source of information on the vehicle.
Keep your industrial-railway sightings organised
Works number, keeper, location and date in one app – so every encounter stays traceable later.
Summary
- Brake technology is no side issue on shunting locomotives – it shapes the entire operating routine.
- Four coupled axles in a rigid frame stand for heavy shunting and transfer service.
- For a reliable identification, the builder's plate with manufacturer, type, works number and year of build is decisive.
- Shunting areas are especially dangerous because vehicles are moved unannounced and without signals.
Frequently asked questions
What does MaK 600 D mean?
The designation comes from the type programme of Maschinenbau Kiel. The number gives the engine power in horsepower, the letter D stands for four coupled driving axles in a rigid frame. The type name thus describes power class and running gear in a few characters.
How does the continuous air brake work?
A main air pipe runs the length of the whole train. When it's charged, the brakes are released; when the pressure drops, the brakes apply. The system therefore brakes automatically if the pipe fails – for example if a train divides. This fail-safe behaviour is why it has become the worldwide standard.
Why does a locomotive additionally need a handbrake?
The air brake doesn't hold a parked vehicle permanently, because the pressure drops away over hours. The mechanical parking brake – handwheel or spindle – works independently of that and secures the vehicle at a standstill. On shunting locomotives it's therefore compulsory equipment.
What is a direct locomotive brake?
A directly acting supplementary brake with which the locomotive alone can be braked, without applying the continuous train brake. This allows sensitive manoeuvring when setting wagons in place or propelling them, and is practically indispensable for shunting service.
What do the brake markings on the vehicle show?
Details of the brake type, brake weights in various brake settings, and the date of the last inspection. They're usually gathered together in the data panel on the side wall. For spotters this panel is valuable, because keeper markings and inspection date are often found there alongside the brake data.
Why do shunting locomotives carry the type code 98?
The first two digits of the twelve-digit vehicle number denote the vehicle type. 98 stands for diesel shunting and light locomotives, 92 for diesel main-line locomotives. The code follows the vehicle's purpose and registration and therefore says more about its operational role than its size does.
Why is braking distance a safety issue in shunting service?
Because shunting movements are often propelled from behind, visibility is limited, and heavy groups of wagons react sluggishly. Even at low speed, several vehicle lengths pass before a stop is reached. That's why an especially large safety margin applies in shunting areas – and why they're no place for a photo spot.
Where do you see the MaK 600 D today?
On industrial, port and siding railways, in transfer traffic and increasingly with societies. Fleet numbers, keepers and locations change constantly through sales and withdrawals. Current sightings are more reliable for this group of vehicles than older fleet lists.
Log your sighting of the MaK 600 D
Date, location and vehicle number logged in seconds – and visible to the community.
Related classes
MaK 650 D
The MaK 650 D is a four-axle shunting locomotive with a rigid frame. To identify one, read the data panel – not the paint job.
ShunterMaK 1200 D
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