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.