Here are the Railway Station codes to be used for traveling to Sabarimala by train
Other nearby stations for Sabarimala are Tiruvalla ( Railway Station Code :TRVL), Kottayam (Railway Station Code : KTM) and Changanassery (Railway Station Code :CGY).
For long distance trains ends journey at Erkakulam (KOCHI/COCHIN) book for the Ernakulam Junction (Railway Station Code : ERS).
See here for route and tips on how to travel by long distance trains to Sabarimala from outside Kerala.
For Sabarimala book in a train travel via Kottayam route. Chengannur is the stations for Sabarimala
Rail and Road Routes to Sabarimala
India has more than 200 wildlife sanctuaries and about 100 of them are classified as National Parks. Here is a list of national parks of India. The names of the national parks are organized according to the state in which they belong to. Some of the national parks are speared over many states and only one state in listed in such cases. You can see the same list of national parks in India here arranged in the alphabetical order of their names.