DR Class E 77

Updated: August 2026 – Anyone wanting to understand what German electric locomotives looked like before the bogie era finds a textbook example in the DR Class E 77: two-part articulated chassis, carrying axles at the ends, rod drive, all visible from the outside. The class dates from the 1920s and today survives exclusively as museum stock.

What is the DR Class E 77?

The E 77 is an electric locomotive of the early Reichsbahn generation with a two-part articulated chassis, rod drive, and one carrying axle at each end of the vehicle. It was built in the 1920s, in the phase when electric traction in Germany grew beyond trial operations and was procured in series for the first time.

In design terms it therefore belongs to the same world as the early steam locomotive generations: motors within the frame, power transmission via jackshaft and coupling rods, chassis and body clearly separate. Only later classes moved the drive into the bogies and made the rods disappear. Today the E 77 is museum stock with no regular service.

The numbering system behind the E

The Reichsbahn’s designation scheme looks cryptic from today’s perspective, but it follows a logic that can be traced. The letter E identified the electric powered vehicle, and the number after it roughly grouped it by design and purpose. So, for instance, the small shunting and branch-line machines gathered in the 6x group – from the Class E 60 through the E 63 to the tiny Class E 69.

Step	What happened	Example
Reichsbahn scheme	Letter E plus two digits	E 44, E 60, E 77, E 94
Conversion at the Bundesbahn	A 1 prefixed, letter dropped	E 44 becomes 144, E 94 becomes 194
The Reichsbahn’s own scheme in the east	Different number ranges for the same designs	Same type of locomotive, different number
Today’s UIC number	Twelve digits, with a type code at the front	97 for vintage and shunting electric locomotives

In practice that means: one and the same type of locomotive can appear to you under several numbers, depending on which operational state a museum is presenting. How today’s twelve-digit number is structured is explained in the guide to reading the UIC number.

How to identify an E 77 in the field

The general order – type of drive, chassis, axles, marking – works for any unknown vehicle. It is described in detail in the guide to identifying rolling-stock classes.

Spotting and photography in a museum setting

You will not encounter the E 77 lineside. The route to a shot leads via museums, collections and event dates – with the advantage that the vehicle stands still there and you can work at leisure. Vehicle depots such as the DB Museum Koblenz collect exactly the machines from the era of large-scale electrification.

• Take the profile shot first. The articulated chassis is only fully legible from the side. A slight three-quarter view then adds the front.
• Photograph the chassis separately. A tight crop of the jackshaft, main rod and carrying axle documents the design better than any wide shot.
• Plan for the light indoors. Museum halls are darker than they look. A higher ISO is the better compromise over a shaky handheld shot.
• Follow the operator’s instructions. Tracks, inspection pits and workshop areas are out of bounds even on museum premises unless explicitly opened up – vehicles are moved there too.

Where museum societies publish their dates and how to turn that into a tour is shown in the guide to heritage railways and special workings.

The first generation of electric locomotives at a glance

To place the E 77, it helps to look at the starting point. When the first larger sections of network in Germany were electrified from the 1910s and 1920s onwards, there was no established state of the art for electric locomotives. Manufacturers therefore carried over what they knew from steam locomotive building: a sturdy frame, main and coupling rods, a chassis with clearly separated driving and carrying axles. The electric motor simply replaced the boiler and cylinders.

That produced three features shared by practically all vehicles of this generation, which help you identify them:

• Visible drive. Jackshaft, main rod and coupling rods sit on the outside. You can count the driven axles.
• Separate driving and carrying axles. Different wheel diameters are a direct clue to the wheel arrangement.
• Box body on a separate frame. Body and chassis look like two separate assemblies, not a single styled unit.

Only with the introduction of individual axle drives, and later bogies with enclosed drive, did these features disappear. Vehicles such as the four-axle Class E 44 mark this transition: no more rod drive, but bogies instead and a noticeably more modern silhouette. Anyone seeing both generations side by side immediately understands why the vintage vehicles look so unmistakable in photos.

Common mix-ups

The closest comparison vehicles are the six-axle-driven Class E 95, which also has a two-part chassis, and the Class E 94, whose crocodile silhouette with a central cab looks distinctly different.

Verdict

The E 77 is not a vehicle to look for lineside, but one for the museum – and there an excellent example to study. Articulated chassis, carrying axles, jackshaft and coupling rods show what German electric locomotives looked like before bogies with enclosed drive became the standard. Anyone who can read the chassis can confidently place the whole vintage family from there.