- The yellow colour has highly visibility from far away distance to loco pilots to spot the railway station easily. The station names are clearly visible in both day and night and even in foggy weather situation during the winter season.
- The yellow colour better contrast with the black colour. The black letters written on the yellow board is easy to read from far away distance.
Moreover, the colour yellow is placed at third position among the seven primary colours, in terms of wavelength in the visibility spectrum. The more the wavelength of colour, the farthest it can be seen.
In terms of wavelength, the colour red tops the list but it is used to stop trains at signals. The red colour is not used on the station board because the lateral peripheral vision of yellow colour is 1.24 times higher than that of red colour.
Hence, due to above mentioned points and explanations, the railway station names are written on the yellow board in Indian Railways.
IMAGE: Google.