To get a supertrain, press Ctrl+Alt and Leftclick in the upper left corner of the main menu. it should say "supertrain".
You can try the other edges too (there it does something else)
To show enemy trains in the map (you have to redo this everytime you open the full map)
press Ctrl+Alt and Leftclick in the bottom left edge of the map
now there are enemy trains shown as yellow icons,
black icons are the horda,
nomads are red and
mammoths are green
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