It is a trend where the Victorian era is mixed with all kinds of much later, sometimes futuristic components. Steampunk: Classical future music
The technical appearance of machines from that steam era is extremely classic, but not quite as intended in the classic way.
The trend is born in print, has its looks through sci-fi films and games and has landed in practice with creative builders with a desire for red copper and a lot of traditional handicrafts.
The design is based on coaches, very early combustion technology and lots of decoration.
Hard core classic enthusiasts can and may be bewildered by these kinds of creations.
But we are impressed.