Earlier quoted context omitted.
They run in several countries, but fundamentally they are very expensive (far more than $10 an hour)
My knowledge of them is from here[0] and I understand their availability to have generally declined over the past several years. [0]: https://www.seat61.com/motorail-trains.htm
Sleepers have had a little resurgence over the last year or two, but motorail demand is low and costs are high. Demand at market price is even lower. With a good motorway network and reliable cars people just aren’t willing to spend 5 times the price to go on a train.
Even they were, it’s not sustainable. Far better to fly or train to a remote city and hire a car on arrival.