Well, this "Local Name" has been added by Moderator recently in order to avoid confusion related to those stations where they are called in a different name rather than the official one more frequently. For example, Silchar is known as Tarapur locally. So, for these stations, a local name will be added here. And for stations where these two names are same, the local name box has to be left blank. Now it is clear to you, I hope. Thanks. :)