This station is our Nation's property rather than a Political Party's property so there's no chance of any political party symbol.
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PS: In 1998 or so, Raebareli and Amethi were BJP and not Congress strongholds as Parliamentary Constituencies so it only shows that cities/townships/villages etc. are fixed for our Indian Railways forever but not for any one political party... aaj koi hain, kal nahin... the politics keeps changing but not our Dear IR :)