NS TRAXX (Class 186)

Updated: August 2026 – When a Dutch passenger train crosses the German border, there’s a good chance a multi-system locomotive is hauling it. The TRAXX Class 186 is built for exactly that: four axles, several pantographs, several traction current systems. This page explains how to identify it, what its type code means, and why it’s practically indispensable on cross-border services.

What is the TRAXX Class 186?

The Class 186 is a four-axle multi-system electric locomotive from Bombardier Transportation’s TRAXX family. Its defining feature is the ability to handle several traction current systems – DC as well as AC. That lets it cross system boundaries where a single-system vehicle would necessarily have to stop.

For the Netherlands, that’s not a nice-to-have but a requirement. The classic network runs on 1.5 kV DC, the new-build line on 25 kV AC, and Germany on 15 kV. Both Dutch systems are operated by the infrastructure manager ProRail. A pure DC locomotive like the Class 1700 therefore stays within the country. Wherever loco-hauled cross-border trains run, multi-system technology comes into play. At the German-Dutch crossing of Emmerich am Rhein, you can watch this changeover every day.

Reading the type code: TRAXX F140 MS

Unlike a plain class number, the manufacturer’s designation is descriptive. It works like a shorthand spec sheet.

Because the TRAXX family runs right across Europe, the shape alone is never enough to identify it. The bodies of the 185, 186 and 187 look very similar to each other – only the number on the side wall and the full twelve-digit code bring clarity. How this is structured and what the country code tells you is explained in the piece on the UIC number and its check digit. If you want to cleanly separate a train number from a vehicle number, the differences are set out in the guide to finding a train number.

Placing it within railway operations

The 186 sits at an interface: it’s a passenger and a freight locomotive at once, depending on who operates it. On the Benelux freight corridor, Lineas is a good example of this. That dual role also shapes where you’ll realistically encounter it. For freight, the marshalling yard at Kijfhoek is the obvious location. If you want to see loco-hauled cross-border services, Venlo is the better choice.

Setting	Chance of a sighting	Why
Border stations in the German-Dutch area	high	System changeovers and stops mean dwell time
Large hub stations with international services	high	Locomotive changes and long stops
Freight lines and marshalling yards	medium	TRAXX locomotives are present in freight service across Europe
Pure multiple-unit routes	low	No role without loco-hauled trains
The new-build line for high-speed services	low	Fast multiple units such as the ICNG dominate there

It’s worth looking at the German side too: the same platform runs there under the collective term Bombardier TRAXX for numerous railways. Know both sides and you’ll quickly notice that keeper livery and country of operation regularly diverge on leased vehicles. Which stations suit such observations particularly well is shown in the overview of the best stations for trainspotting in Germany.

Spotting and photo tips

Keeper, state of registration and livery: why matching them up is tricky

Hardly any other locomotive family sees its appearance and its actual ownership diverge as often as the TRAXX. The reason is the business model: a substantial share of these locomotives belongs to leasing companies and is rented out to changing railways. That means livery, markings, country of operation and operator can tell four different stories.

Three levels are worth keeping apart:

• The state of registration appears in the country code of the twelve-digit vehicle number – 84 for the Netherlands, 80 for Germany. It tells you where the vehicle is registered, not where it runs.
• The keeper is marked in the keeper code on the side wall. It can be a leasing company that doesn’t run any trains itself.
• The current user is best identified by the livery, stickers and the train the locomotive is currently hauling – and that’s exactly what changes fastest.

For spotters, that makes the class more interesting, not more difficult. A locomotive running in front of a Dutch passenger train today could be in a completely different livery in front of a freight train in southern Germany next year. Recording number, keeper code, livery and date at every sighting documents these movements – and builds up a picture over the years that no static vehicle list can provide.

One practical tip for identification in the field: never rely on colour. The TRAXX body is nearly identical across several classes, and a full advertising wrap or special livery changes the impression dramatically. The digit sequence on the side wall is the only feature that stays unambiguous. A second photo of just that marking costs you two seconds and saves every argument later.

Common mix-ups

Verdict

The Class 186 is less a single vehicle than a principle: it stands for the multi-system technology without which cross-border traffic between the Dutch DC network and its neighbours wouldn’t work. Its type code reveals platform, speed and system capability; its number identifies the specific locomotive. Read both and you’ve cleanly placed one of Europe’s most revealing locomotives.