Class 996

Updated: August 2026 – A vehicle that looks like a railbus but has no cab and can’t move under its own power: that’s the Class 996, the trailer car of the Uerdingen railbus family. This page explains why a vehicle like this carries its own class number, how you reliably tell it apart from a driving trailer, and what to watch for when documenting historic formations.

What is the Class 996?

The Class 996 is the unpowered trailer car of the Uerdingen railbus family, originally run by the Deutsche Bundesbahn as VB 98. It has neither an engine nor a cab and consequently can’t move under its own power. Its sole job was to provide capacity when a railcar alone wasn’t enough.

With the switch to computer numbers in 1968, the VB 98 became the Class 996. It thereby stayed with its family in numbering terms too – just in the number range for unpowered vehicles, while the railcars of the Class 798 moved into the 7xx range.

The VT/VS/VB system: three roles, three number blocks

Only someone who knows the old class abbreviations understands historic railcar trains. They don’t describe the type, but the role within the formation:

Abbreviation	Meaning	Drive	Cab	Number range after 1968
VT	Combustion-engine railcar	yes	yes	7xx
VS	Driving trailer	no	yes	9xx
VB	Trailer car	no	no	9xx

The whole logic of the railbus formation follows from this table. The railcar supplies the power, the driving trailer allows the train to be driven from the other end, and the trailer car simply increases the number of seats. A train made up of a railcar and a plain trailer car therefore isn’t reversible in the sense of driving-trailer operation – that needs the Class 998.

Above all this today sits the twelve-digit UIC number, whose first two digits give the type. How this number is structured and what the check digit is for is explained in the guide to the UIC number.

How to identify the trailer car within a formation

How to build up a feature chain like this in general is described in the guide to identifying locomotive classes.

Placing it in railway operations

The trailer car was the flexible element in secondary-line operation. Demand on a secondary line is anything but even: heavy school traffic in the morning, empty runs at midday, a rush again in the evening. Rather than procuring an oversized vehicle for the peak, operators coupled on trailer cars and left them standing during quiet periods. Just how sparsely populated the routes were that this was designed for can still be traced today at the Schwäbische Alb-Bahn (SAB) between Münsingen and Schelklingen.

This logic still holds true today – modern operators solve it through multiple units of short railcars rather than trailer cars. The principle is the same: deploy capacity where it’s needed, and don’t drag it along otherwise.

The difference lies in the effort involved. A trailer car had to be coupled and uncoupled at the station, which required shunting moves and staff. Modern railcars couple automatically and can be assembled within minutes. That’s exactly why the classic trailer car has vanished from scheduled service, even though the idea behind it was never wrong.

For vehicle knowledge, the trailer car still matters. It shows that a train consists of vehicles with different roles, and that these roles can be read off from visible features: drive, cab, both or neither. Once you’ve internalised this distinction, you can apply it to practically any railcar train – even to modern vehicles, where the division of roles disappears from view inside but continues to exist technically.

Spotting and photo tips

Trailer cars are often skipped over photographically – unfairly. Anyone who only photographs the railcar documents half the formation.

In practice that means: find a viewpoint from which the complete formation fits into the frame – if in doubt, further away and with a shorter focal length. Add a shot of the side wall with the number panel for every vehicle. Note the date, location and occasion right at the sighting; how to organise that for the long term is described in the guide to the sighting logbook.

A common mistake is to treat the trailer car merely as an add-on and crop it out of the frame. Especially with short formations, it’s worth choosing a viewpoint further away and showing the formation in full – the picture loses nothing in impact and gains considerably in informational value.

House rules apply on museum and society sites. Stay on designated paths, respect barriers and don’t enter track areas. Stabled vehicles often stand in areas where shunting takes place – a seemingly unused track isn’t a safe viewpoint.

Common mix-ups

Incidentally, the first railbus generation also had trailer cars but no driving trailer – covered on the page about the Class 795.

Verdict

The Class 996 is a good example of the fact that a train consists of more than the vehicle at the front. The trailer car has no drive, no cab, and yet its own number, its own inspection deadlines and its own history. It can be identified in seconds: railbus shape, but an end wall with no cab. And anyone seriously documenting historic formations notes it just as carefully as the railcar in front of it.