‘Science Express,’ a biodiversity special exhibition on wheels is arriving Kakinada Town station on a three-day halt on Friday. A specially designed train with 16 air-conditioned coaches provides knowledge on biodiversity and climate change to the students and teachers as well. The exhibition is open from 10 a.m. to 5 p.m. and a unique science lab attached to the exhibition can be used by the students with prior permission from the authorities concerned. The entry into the exhibition is free and the exhibits are self-explanatory, according to a South Central Railway press release issued here on Thursday.