Technical guide
Bogie exchange: changing a wagon between gauges
Bogie exchange means lifting a wagon and replacing its running gear with bogies of the other gauge. The cargo stays in the wagon, untouched. It is the alternative to transshipment and suits freight that is difficult to move or awkward to re-secure, but it needs a dedicated facility.
What a bogie is
A bogie is the truck a wagon rests on: a frame with two or more axles, wheels, suspension and brakes, which swivels relative to the wagon body so the vehicle can take curves.
A modern freight wagon sits on two of them, one at each end. The wheels are fixed on the axle at a spacing matching a single gauge, which is precisely why a loaded wagon cannot cross a break of gauge without intervention.
How the operation runs
Simple in principle, less so in execution. The wagon is moved into a hall or onto a specially equipped position, where:
- Connections between body and bogies are released, brake pipes included.
- The wagon is jacked vertically, on synchronised jacks or a dedicated lifting frame.
- The old bogies are rolled out sideways onto a service track.
- Bogies of the other gauge are brought in underneath.
- The wagon is lowered, aligned and reconnected.
- Brakes are tested and the wagon is checked before release.
It requires a purpose-built installation, a stock of bogies for both gauges and trained staff. It is not something improvised on any siding.
Bogie exchange or transshipment
| Criterion | Bogie exchange | Transshipment |
|---|---|---|
| The cargo | Stays untouched in the wagon | Moves into another wagon or onto a truck |
| Risk to cargo | Minimal — no handling | Proportional to how fragile it is |
| Best for | Hard-to-secure or sensitive freight, full wagonloads | Bulk, palletised goods, pieces that lift cleanly |
| Needs | Dedicated facility and bogie stock | Handling equipment and a working front |
| Flexibility at destination | Cargo stays on rail | Can go straight onto a truck |
The choice is rarely purely technical. It depends on what is available along the route, on the commodity, and on where the consignment finishes. If it ends on a truck regardless, transshipping directly removes a leg.
What we do
Our terminal at Dornești works by transshipping the cargo: tracks on both gauges, handling equipment, and mobile cranes for pieces too heavy for standard equipment.
We explain bogie exchange here because it is the other half of the answer to what happens at the border, and because many shippers do not know both options exist. If your consignment would genuinely be better served by a bogie exchange, we will say so rather than sell you the operation we happen to run.
Frequently asked questions
Frequently asked questions
How long does a bogie exchange take?
It varies considerably between facilities, so we do not quote a figure.
Does the cargo have to be unloaded?
No — that is the whole point of the method.
Which is cheaper?
It depends on the commodity, the volume and the destination. For cargo finishing by road, direct transshipment removes a step.
Do you do bogie exchange at Dornești?
No. We work by transshipping the cargo. Tell us what you are moving and we will say honestly which suits it.
Are there variable-gauge wagons?
Axle systems with adjustable gauge exist and are used on certain routes, but they are not widespread in this region's freight traffic.
Not sure which method suits your cargo?
Describe the consignment and the route, and we will tell you what can be done here and what cannot.