Toy trains are small trains which run in mountain regions..
as far as i know we have 3 toy trains :
1)Shimla toy train ( running from Kalka to Shimla)
2)Darjeling toy train ( from new jalpaiguri - darjelling)
3)ooty/nilgiri toy train ( no idea)
i have travelled in both shimla and darjelling toy train.. Shimla toy train is good , Divine scenes, over 100 tunnles the longest being over 100m long...quite fun.. look out of your window and at times one would get scared of the deep valleys..
darjelling toy train run on the same road where cars/buses/bikes etc. run.. its good as well but its much time consuming.. there a station named "ghum" is the highest stn in india. there's a point called as batasia loop where the train takes a "U" turn or makes an angles of 360* marvelous!!
both are amzing. Hopefully some other member would throw some light on ooty toy train but i guess it would better than others..