Graz-Köflacher Bahn und Busbetrieb GmbH (GKB)

Updated: August 2026 – Most transport companies reveal one thing in their name. Graz-Köflacher Bahn und Busbetrieb GmbH reveals two: it names rail and road in the same breath. What sounds like a formality is a substantial operational difference – two legal frameworks, two staff qualifications, two kinds of vehicle identifier. This page shows how to place a company like this and how to record sightings cleanly on both modes of transport.

What is Graz-Köflacher Bahn und Busbetrieb GmbH?

Graz-Köflacher Bahn und Busbetrieb GmbH – GKB for short – is an Austrian transport company that names its field of activity right in the company name: Bahn (rail) and Busbetrieb (bus operation). The name element “Graz-Köflacher” is a regional origin marker and marks the company out as a private railway with a long tradition – a railway company alongside the state railway.

For classification purposes, that means two things. On rail, the GKB is a railway undertaking and therefore distinct from an infrastructure manager, which owns the track. On the road, it operates within a completely different framework, one that has nothing to do with railway law. The shared company name bridges this difference visually – operationally, it remains in place.

Rail and bus: two modes of transport, two rulebooks

A rail and bus operation is, in practice, two companies in one. That is barely noticeable if you only look at the vehicles – and becomes obvious the moment you ask who is responsible for what.

On the track, you need a safety certificate, booked paths, signal-controlled running with block spacing, and drivers with a driving licence, route knowledge and vehicle authorisation. The right of way is a dedicated formation, the braking distance is far beyond the line of sight, and there is no way to swerve.

On the road, road transport and passenger transport law apply. Driving is done by sight, on a public road surface shared with everyone else. The vehicle carries an official number plate, staff carry a driving licence of the matching category, and stops exist wherever they have been approved – not wherever there happen to be tracks.

How to recognise the same company on rail and on road

The guide to identifying classes shows how to systematically identify unfamiliar rail vehicles. For local transport across all modes, the overview for public transport spotters is worth a look.

What differs when documenting

Feature	Rail vehicle	Bus
Unambiguous identifier	twelve-digit vehicle number	official number plate
Keeper marking on the vehicle	country code plus keeper marking, e.g. A-	via the registration, not lettered on the vehicle
Right of way	dedicated formation	shared public road surface
Mode of driving	signal-controlled with block spacing	driving by sight
Staff qualification	driving licence with route and vehicle knowledge	driving licence of the relevant category
Typical change of location	at stations and sidings	at the depot and terminal stops

Anyone collecting both therefore needs two note-taking patterns. A bus sighting without a number plate is just as worthless as a train sighting without a vehicle number – it’s just less often noticed with buses, because the destination display creates a false sense of certainty.

Vehicle designations at state railway and private railway

In Austria, vehicle families are called Reihe (class) and carry a four-digit number. The first digit gives the type of drive: 1xxx electric locomotive, 2xxx diesel locomotive, 4xxx electric railcar, 5xxx diesel railcar. One example from the 5xxx group is the Class 5047, a single-unit diesel railcar.

Private railways also carry their own designations that have grown historically and do not always follow the state railway scheme. The class database also documents the GKB Class 29, a steam locomotive, and the historic railbus GKB VT 10 / 5010 – good examples of how a private railway often carries on its own vehicle history independently. Just how alive this tradition is in Styria is also shown by the Erzbergbahn, which runs historic vehicles on a former ore-hauling line.

You’ll find comparable naming patterns at other Austrian companies: Steiermarkbahn und Bus also names both modes of transport, Montafonerbahn carries a purely regional name, and Stern & Hafferl is incorporated as a transport company without a place reference. Three names, three sets of expectations – and in all three cases, it is only the vehicle itself that proves what is actually running.

Recording sightings at a rail and bus operator

The guide to reporting sightings describes how to turn this into an entry that is useful for others too.

Common mix-ups

• Reading the company name as a route description – “Graz-Köflacher” is an origin marker, not a timetable or a current route.
• Treating a bus and a rail sighting the same way – the two modes of transport have different identification systems; a note without the matching identifier is worthless.
• Taking a uniform design as proof of ownership – vehicles can be leased or operated under contract.
• Confusing a private railway with a heritage railway – historic vehicles in the fleet do not turn a transport company into an association.
• Equating the class designation with a German Baureihe – in Austria it is called “Reihe”, and the number follows its own system.
• Taking the destination display for a vehicle’s identity – it describes the duty, not the vehicle.

Verdict

The GKB is a good exercise for anyone looking beyond rail alone: one company name, two modes of transport, two rulebooks – and two entirely different ways of unambiguously naming a vehicle. Anyone who masters both documents regional local transport in full, rather than only half of it.