Agar local administration ko dikkat na ho to stations like DHN and TATA may have 3rd language as Bengali. TATA had few instruction boards in Bengali during my visit in 2016-17. Now they have all been renewed with English, Hindi ones.
I guess KGP is only to have 4 languages in SER (3+Odia) in various instruction boards. You may notice them in PF 1A, 2A etc. Though TB includes primary 3 only.