Belief, Aether and a lot of crystals of a certain element.
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Who would summon Doomtrain is an excellent question. For all we know, it could involve something silly with a certain gentleman detective.
I smell a case!
The Case of the Ghost Train!
As for summon as we seen back in Hildibrand Season 1 and Alexander the summon can happen unintentionally as well which we see when a Fake Enkidu was summoned by Gilgamesh and from explanation about how Alexander was summoned.
A Ghost Train story may be enough spark to cause a unintentional summon of Doom Train if enough people started believing in a Ghost Train Story strong enough.
An actual ghost train turning up as part of a Hildibrand investigation is just begging for multiple Scooby Doo references.
http://i.ytimg.com/vi/VbEan62z8RA/maxresdefault.jpg
So we're going to see this fabulous man suplex the Doomtrain? :rolleyes: