Key takeaways
- BB means two two-axle bogies – the doubled letter stands for the bogie design, not more power.
- DHG stands for diesel-hydraulic with cardan-shaft drive: shafts and axle gearboxes instead of a jackshaft and coupling rods.
- Bogies are essential for heavy shunters to combine a long wheelbase with tight curve radii.
- Type code 98 classifies the vehicle as a shunting and small locomotive – the line to a mainline locomotive under 92 is a question of intended use and registration.
- Keeper, livery and location change constantly – document the works number and date, not the colour.
Contents
Fact file
| Vehicle type | Diesel-hydraulic shunting and works locomotive |
|---|---|
| Manufacturer | Henschel & Sohn, Kassel |
| Type code | DHG = diesel-hydraulic with cardan-shaft drive, 1200 = engine output in PS (metric horsepower) |
| Wheel arrangement | BB – two two-axle bogies, all four axles powered |
| UIC type code | 98 (diesel shunting and small locomotive) |
Identifying features
Is this really the class in front of you?
- Four axles in two bogies – the axle groups pivot relative to the frame
- Noticeably larger body than the three-axle types in the same programme
- No coupling rods running the length of the locomotive: cardan-shaft drive to axle gearboxes
- Sturdy frame with shunting steps, running rail all round and shunting-radio equipment
- Type line on the builder's plate starts with DHG and ends in BB
- Setting: heavy works railways, ports, transfer traffic between connecting and main-line network
Updated: August 2026 – When a shunting locomotive suddenly stands on four axles in two bogies, the whole duty profile changes. The Henschel DHG 1200 BB belongs in this class: big enough for heavy transfer trains, built for works track with tight radii. This page shows what the wheel arrangement in the name means and where the line to a mainline locomotive lies.
Heavy shunters are rare subjects
They run without a timetable and mostly on private land – log the find when you have it.
What is the Henschel DHG 1200 BB?
The Henschel DHG 1200 BB is a four-axle, diesel-hydraulic shunting and works locomotive on two bogies, built to the type programme of Henschel & Sohn in Kassel. The name breaks into three parts: DHG for diesel-hydraulic power transmission with cardan-shaft drive – the torque converter came from suppliers such as Voith Turbo – 1200 for the engine output in metric horsepower, BB for two two-axle bogies with powered axles.
In European vehicle numbering, type code 98 stands for diesel shunting and small locomotives. That such a powerful vehicle is placed there and not under 92 for diesel mainline locomotives shows the heart of the system: it’s about the intended use, not size or power. A 98 is built for shunting, spotting and transfer moves – even when it’s bigger than some mainline locomotive.
Reading the wheel arrangement: why BB isn’t the same as B
The doubled letter is the most important sign in the whole name. It doesn’t describe more power, but a different undercarriage design.
| Notation | Meaning | Typical design |
|---|---|---|
| B | two coupled axles in a rigid frame | small works and shunting loco |
| C | three coupled axles in a rigid frame | medium-weight shunting loco |
| BB | two bogies with two coupled axles each | heavy shunting and works loco |
| Bo’Bo’ | two bogies, each axle individually powered | three-phase AC and diesel-electric designs |
| CC | two bogies with three coupled axles each | very heavy industrial and mainline locos |
There are two conventions to know here. The apostrophe marks a bogie, the lower-case o an individual axle drive – so Bo’Bo’ means something different from BB, even though both have four powered axles. With BB, the axles within one bogie are mechanically coupled and run forcibly in sync.
Why bogies in heavy shunting duty
Shunting locomotives face a conflict. They need plenty of adhesive weight on powered axles to start heavy groups of wagons. At the same time, they have to negotiate the tight curves that are the rule on works track, loading facilities and port railways.
Rigid frame: short but limited
Two or three coupled axles in the frame are simple and robust. From four axles upward, however, the wheelbase becomes a problem for tight curves.
Bogies: long and yet flexible
Two pivoting axle groups adjust on curves. The locomotive can therefore become longer and heavier without breaking the curve radius.
Cardan shafts instead of rods
A continuous rod drive across a bogie isn't practicable. That's why bogie locomotives mostly carry cardan shafts and axle gearboxes – marked at Henschel by the G in the type name.
Comparable vehicles of the same class exist at other works: the Krauss-Maffei M 1200 BB with its own type code and the MaK 1200 D from the Kiel tradition. A step below in the same programme sits the Henschel DHG 700 C with three axles in a rigid frame.
Keep an eye on transfer runs
Community sightings show you where industrial locomotives were last reported – before you set off.
Where these locomotives work – and how you spot them
Four-axle works locomotives only make sense where large amounts of mass are moved constantly: steel and chemical plants, large ports, power-station connections, transhipment terminals. The most interesting moment for onlookers is the transfer run, the move between the connecting line and the public network. There the vehicle leaves the works site for a short stretch and becomes visible from outside.
Such runs follow no published timetable, only the works’ own operating schedule. Anyone wanting to catch one needs patience and current tips. How to watch freight and transfer traffic at all is covered in the article on Germany’s freight-train radar; choosing a spot in a shunting setting is explained in the guide to spotting at a marshalling yard.
Shunting areas are especially dangerous
In shunting service, vehicles are moved without warning and without a signal, often pushed and with broken sightlines. Groups of wagons can start moving at any time. Works, port and connecting lines are private land under the operator's house rules. Watch only from publicly accessible ground and never enter track areas.
What this means for distances, choosing a spot and behaviour at crossings is covered in the article on keeping a safe distance and the rules at the track.
Photo tips for large shunting locomotives
Four-axle locomotives make different demands than small works locos. They’re long, boxy and almost always stand in a busy setting of wagons, masts, fences and buildings. Four points help:
- Play up the length rather than fight it. A three-quarter view from roughly 30 to 40 degrees shows the front and side wall together and doesn’t leave the vehicle looking as flat as a pure side shot.
- Keep the bogies visible. They’re the decisive identification feature. Too low a vantage point or a platform edge in front hides exactly what matters.
- Check the background beforehand. In an industrial setting, the image rarely gains from more detail. Look for a position where the locomotive stands out clearly from the background.
- A second shot for the lettering. The builder’s plate, vehicle number and keeper marking belong in their own shot, otherwise the sighting can no longer be matched up later.
Because shunting runs happen irregularly and often with changing direction of travel, it’s worth choosing a spot where both directions of travel work. Unlike with a scheduled train, you’ll rarely get a second chance on the same day here – and moving in closer to the track isn’t an option.
Common mix-ups
It points to a DHG 1200 BB if …
- you count four axles in two pivoting bogies
- no continuous coupling rods run along the locomotive
- the builder's plate names Henschel & Sohn and a DHG type line
- the vehicle number starts with 98
Look more closely if …
- you see four axles but can't tell whether they're powered individually
- the locomotive is lettered for mainline duty and the type code reads 92
- the bodywork no longer matches the type picture after a rebuild
It isn't a DHG 1200 BB if …
- the axles sit in a rigid frame without bogies
- coupling rods run between the driving axles
- a different manufacturer is named on the builder's plate
Verdict
The Henschel DHG 1200 BB shows how much a wheel arrangement can tell you. Four powered axles on two bogies mean heavy work on tight track – and type code 98 makes clear that, despite the size, it’s about shunting, not mainline duty. Anyone who reads both pieces of information together has understood the vehicle operationally before knowing a single power figure.
Quick verdict
BB means two two-axle bogies, DHG means cardan-shaft drive, 98 means shunting duty. These three facts classify the locomotive – keeper and livery, by contrast, are snapshots.
Collect industrial locomotives systematically
Type, works number, location and date cleanly recorded – so you instantly see which designs you're still missing.
Summary
- Four-axle shunting locomotives on bogies cover the upper power range of works and transfer traffic.
- The BB wheel arrangement is the quickest recognition feature and sets these vehicles apart immediately from the bogie-less B and C types.
- Type code 98 separates shunting vehicles from mainline diesel locomotives; intended use and registration decide, not size.
- Watching happens only from publicly accessible locations – works and port railways are private land.
Frequently asked questions
What does the wheel arrangement BB mean?
BB describes two two-axle groups, each sitting in a pivoting bogie. The letter B stands for two coupled axles, the doubling for the split across two bogies. All four axles are powered. For a locomotive with individually powered axles, Bo'Bo' is written instead.
Why do heavy shunting locomotives have bogies?
Because they have to meet two requirements at once: plenty of adhesive weight on four powered axles, and still tight curve radii on works track. A rigid frame with four coupled axles would be too long for that. Bogies resolve the conflict, because the axle groups can adjust on curves.
What does the G in DHG mean?
It stands for cardan-shaft drive. Power goes from the torque converter via cardan shafts to axle gearboxes at the wheelsets. Visible coupling rods disappear as a result. With the pure DH design, by contrast, power runs via a jackshaft and exposed rods to the driving axles.
Where's the line between type code 98 and 92?
The first two digits of the twelve-digit vehicle number denote the vehicle type: 98 for diesel shunting and small locomotives, 92 for diesel mainline locomotives. What matters is intended use and registration, not size or power. A heavy shunting locomotive can therefore carry 98 even though it's bigger than some mainline machines.
Do such locomotives also run on the public network?
That depends on the registration of the individual vehicle and on the keeper. Transfer runs between a connecting line and the main network are a typical application, but by no means given for every locomotive of this design. If in doubt, check the vehicle number and the lettering – and don't rely on the vehicle's size.
How do I tell BB from Bo'Bo'?
By the drive within the bogie. With BB, the two axles of a bogie are mechanically coupled and run forcibly in sync. With Bo'Bo', each axle has its own drive. This isn't always obvious from the outside – the type line on the builder's plate helps further.
Where do you encounter four-axle works locomotives?
At sites with heavy wagon traffic: steel and chemical plants, large ports, power-station connections and industrial transhipment yards. Location and keeper change constantly, though, because such locomotives get sold and hired out. Current sightings are noticeably more reliable here than older fleet lists.
Am I allowed to photograph on a port or works railway?
These sites are private land; the operator's house rules apply. Entering and photographing are only permitted with consent, and track areas are off limits altogether. Photographing from publicly accessible land is a different situation, but it still depends on the individual case – ask beforehand if in doubt.
Log your sighting of the Henschel DHG 1200 BB
Date, location and vehicle number logged in seconds – and visible to the community.
Related classes
Krauss-Maffei M 1200 BB
The Krauss-Maffei M 1200 BB is a heavy diesel shunting locomotive on two bogies. The type name reveals power class and wheel arrangement – here's how to read it correctly.
ShunterMaK 1200 D
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