Minecraft wiki entry for Train_station, associated text: 200+ redstone dust (You may need more depending on how big it is).
64+ gold ingots (For powered rails depending on your decision).
100+ iron ingots (For rails and tools).
1+ stone pressure plate(s) (Use wooden pressure plates for ticket collectors shown below).
Lots of wood (2 stacks or more).
500+ building material (cobblestone, stone, brick, dirt, etc...)