Vy Tog AS

Updated: August 2026 – Before you even look for a company logo in Norway, it’s worth looking up first. Does an overhead wire hang above the line or not? That single question determines what kind of vehicle can even run there – and it’s answered in a second. Vy Tog AS stands for passenger services in a country where that question is answered “no” unusually often.

What is Vy Tog AS?

Vy Tog AS is a railway operator running passenger services, based in Norway. The legal form AS stands for aksjeselskap, the Norwegian limited company. The name element Tog is the Norwegian word for train – so the company name names the mode of transport directly. The level above it is covered by the entry on the Norwegian state railway Vy (formerly NSB).

You’ll come across this word element right across Scandinavia: under Denmark in this database, for example, you’ll find DSB S-tog and Arriva Tog. Once you recognise “tog” as a building block, you can read such company names correctly straight away, without knowing the language. This database also carries a separate entry for Vy (Vygruppen AS, formerly NSB), which shares the same name stem; the name itself says nothing about how the two entries relate to each other.

Where the overhead wire ends

Norway is electrified – but not everywhere. Large parts of the network carry no overhead wire, and that’s not a transitional state but a permanent feature of the network. A large, thinly populated country with demanding topography concentrates its traffic densely enough to justify overhead wire across hundreds of kilometres on only a few main axes. In Norway, Bane NOR is responsible for the network and its electrification.

For onlookers from central Europe, that’s the real adjustment. Anyone coming from Germany, Austria or Switzerland is used to placing diesel vehicles in passenger service on branch lines. In Norway, even significant main lines can manage without overhead wire – diesel traction there is no sign of a lesser line.

15 kV at 16.7 Hz – and what follows from it

The electrified Norwegian network runs on 15 kV AC at 16.7 Hz. Germany, Austria, Switzerland and Sweden use the same combination. Norway therefore belongs to one large, connected traction-current area spanning northern and central Europe – technically, that’s the unspectacular part of the story.

The practical consequence for vehicle choice is more interesting. Because a significant part of the country manages without overhead wire, electric and diesel vehicles exist permanently side by side, across every type of service.

Feature on the vehicle	Electric	Diesel
Roof	pantograph, roof cabling, insulators	exhaust, fan and radiator housings
Sound on starting off	fans and motor whir	a clearly audible combustion engine
Dependence on the line	only possible under overhead wire	possible anywhere
Typical Norwegian abbreviation	El	Di
Inference about the operator	none	none

The last row is the most important: the type of traction tells you something about the line, nothing about the operator. Our guide to identifying classes shows how to go systematically from vehicle type to the specific class.

Vehicles under and without overhead wire

On the electrified network, electric multiple units shape the picture of passenger services, such as vehicles from the BM73 and BM69 families. On sections without overhead wire, diesel railcars such as the Di 8 take over.

The Norwegian abbreviations follow a clear scheme: El for electric locomotives, Di for diesel locomotives, and Type plus a number for multiple units. It classifies the vehicle type – not the operator, not the line, and not the build year.

Railfanning across a vast network

Where lines are long and settlements are few, the effort shifts from waiting to simply getting there. A spot needs choosing not just for light and composition, but for whether you can reach it and leave it again legally and safely. That applies to electrified main axes just as much as to diesel-worked sections in the back country. One exception is the tourist-marketed Flåmsbana, which operates as its own brand and is correspondingly well set up for visitors.

Anyone photographing under these conditions is better off planning one shot thoroughly than five superficially. Our guide How to take good train photos covers what matters technically.

The transition point is the most interesting spot

Wherever an electrified section turns into a non-electrified one, something operationally interesting always happens: either a vehicle can carry on because it doesn’t depend on overhead wire, or it can’t. It’s exactly at points like this that the question of overhead wire proves to be more than a technical footnote.

For railfanning, these transitions are attractive because vehicles of different traction types come together in a small space. A station at the end of the overhead wire can show more variety in one afternoon than a purely electrified line does in a whole day. Exactly where the overhead wire ends does shift with electrification projects, though – so always check the current state rather than relying on older information.

What you document at spots like this should stay descriptive. “Electric vehicle at the platform, diesel railcar on the neighbouring track, overhead wire ends east of the station” is an observation. “A scheduled vehicle changeover happens here” would already be a claim about the operating pattern that you can’t draw from a single afternoon. The distinction sounds pedantic, but it decides whether your logbook still holds up in a few years’ time – or whether it contains assumptions no one can check any more.

Common mix-ups

• No overhead wire equals branch line – in Norway, even important main lines can lack overhead wire.
• Diesel vehicle equals freight service – diesel railcars in passenger service are entirely normal here.
• Pantograph equals running under wire – an electric vehicle can also be towed or moved dead.
• “Tog” equals a company brand – it’s simply the ordinary word for “train” and appears in several countries.
• Vehicle type equals operator – the type of traction describes the line, not the company.

Verdict

Vy Tog AS is a good reason to pick up a habit that works anywhere: read the line first, then the vehicle, then the number. In Norway that order pays off especially quickly, because electric and diesel operation exist there permanently side by side.