The four-wheeler? Damn, saw a photo a while back but can't remember where.
When the Speno unit visited around 2005-2006, it was hauled around in a similar fashion, except it was sandwiched between two Dutch vans, with a pipe running from the driver's window to the rest of the train. The Speno, which is normally self-propelled, was hired from elsewhere in Europe (Denmark, I think) and had to be regauged by placing on two wagon bogies. I think this arrangement also meant that the unit itself wasn't equipped with train braking, hence the Dutch vans at either end.