how to make a train stay in the rail road and follow the path that is set

Unity Engine
1

i have problems making my train stay in the rail road and follow the past of the rail

i have try every thing i know but nothing happens

2

if i have a set route or path that an object is going to be animated around , i usually take the time to create and animate the path and objects related inside of 3ds (or whatever modelling client you use). I find it is much simpler using the modelling clients tools at hand than trying to set it all up with unitys animation features.

3

um the train is the character of the game i have movement but it live the rail road i need the train to stat there even on turns