Jongudmund

I've no idea. I don't think it's a real type of train. Wikipedia explains that is defined as 'an occupation or any lucrative endeavour that generates considerable income whilst requiring little effort and carrying little risk' and 'a gorging on luxuries, since someone else foots the bill.' So I don't think that real trains are actually involved at all. As such, you'd probably be better directing your efforts at modelling a different kind of real train.

Perhaps the Necropolis Railway might provide inspiration for modelling grave-y trains:

http://www.bbc.com/autos/story/20161018-the-passenger-train-that-carried-the-dead

You’d certainly want it to run well...