The Kodaikanal–Munnar Road (old SH-18) was located in Dindigul District and Theni District of Tamil Nadu and Idukki district of Kerala in South India.
The building, now housing regional office of Tata Tea was Munnar Railway Station of Kundala Valley Railway.
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Top Station was a transshipment point for delivery of tea from Munnar to Bodinayakkanur.
The Neriamangalam Bridge, built across the Periyar river, is often referred as 'The Gateway to the Highranges' as it is on the way to the higher regions of Idukki district, especially Munnar.
Top Station derived its name from its being the uppermost located railway station on the Kundala Valley Railway, built in 1902 between Munnar, Kundalai and this hilltop location.