O&K MC 700

Updated: August 2026 – A shunting locomotive like the O&K MC 700 runs slowly, unobtrusively, and usually where no one’s looking. What surprises many people: on plenty of sites, no one sits in the cab while it does. Radio remote control is widespread in shunting service – and it changes both how the vehicles look and the safety situation on site. This page sorts out both.

What is the O&K MC 700?

The MC 700 is a diesel shunting locomotive from the Orenstein & Koppel works programme. The leading M stands, at O&K, for motor locomotive, the letter C corresponds, in the German wheel arrangement notation, to three coupled axles in a rigid frame, and the number assigns the machine to a size class.

Vehicles like this work on works, port and private siding railways: short distances, tight curves, lots of starting and braking, low speeds. Reliable public figures on power output, years built or production numbers don’t exist for many of these designs – identification therefore runs consistently via observable features and the builder’s plate, just as with the O&K MC 14 C or the Class V 60. Operations and staff there are often provided by service providers such as AnschlussBahnProfis, which run private siding railways for industrial customers.

Radio remote control: what you see on the vehicle

Not every shunting locomotive is remote-controlled, but many are – sometimes from new, more often retrofitted. The equipment is recognisable from the outside once you know what to look for.

Observation	Likely meaning	What follows from it
Aerials and extra boxes	vehicle is equipped for radio operation	can move with no one in the cab
Beacon light on	vehicle is ready to move or in motion	heightened attention, keep your distance
Empty cab	no conclusion that it’s stationary	never read this as a sign of safety
Person with control unit at the track	active radio shunting operation	the track area is in use
No visible radio equipment	conventional operation likely	full safe distance still applies

What that means for spotters in practice

Shunting operations are hard for observers to read: there are no signals, no announcements, no train number. Vehicles are propelled, wagons uncoupled on the move, movements broken off and picked up again. Remote control removes the last obvious clue on top of that – the person in the cab. Where shunting is still done by hand, the staff often come from service providers such as KSV Kompetenz für Schienengebundene Verkehre rather than the works itself.

In practice that means three things. First: a safe vantage point is always one that stays safe even when everything moves at once. Second: patience pays off more than proximity, because shunting movements often repeat the same manoeuvre several times. Third: the interesting details – aerials, coupling, builder’s plate – can be documented from a great distance too, with enough focal length.

Specific vantage points and typical mistakes are covered in the guide to spotting at a marshalling yard. The basic rules on distance are in the article on safe distance from the track. How to record your observations afterwards so they stay usable is shown in the guide to keeping a sighting log.

Where machines like this are found

Shunting locomotives are site vehicles: they often stay assigned to the same facility for years, until traffic there ends. That’s why you’ll find retrofits like radio equipment clustered at businesses with a high transhipment frequency – on larger designs such as the O&K MBB 1200 N just as much as on three-axle machines.

Setting	Visibility from outside	Note
Port and industrial railway	fair to good	often publicly visible sections
Private siding of a business	good, if it crosses roads	movement only on delivery
Transhipment terminal	medium	high operating share, often remote-controlled
Works site behind the fence	poor	private property, no access
Heritage or society railway	good, plannable on event days	vehicles are documented there

Reading the shunting sequence

Anyone who watches shunting operations for a while quickly notices: what looks like aimless back-and-forth actually follows fixed patterns. Knowing them makes watching considerably more rewarding, because you can predict when the locomotive will come back into view.

Typical is transferring wagons: the locomotive fetches wagons from a track, brings them to a loading or interchange point, and returns alone. This movement often repeats several times, because a track is worked through in several groups. Anyone who misses the first run generally gets a second chance.

Also common is running round: the locomotive moves from one end of the wagon group to the other to change direction. For photographers this is the most interesting moment, because the locomotive runs alone then and is visible from several angles.

And finally there’s transfer traffic: the run between the works track and the connection to the public network. It usually happens at recurring times of day, and it’s the moment a works locomotive becomes visible from outside at all.

Common mix-ups and how to rule them out

Verdict

The O&K MC 700 is a typical example of a group of vehicles about which barely any reliable public detail exists – and which can still be identified cleanly. Axle count, frame type and builder’s plate lead to identification, while aerials and extra boxes tell the operational history. And remote control is the reason no rule can ever be relaxed in a shunting area.