When I had my old battered Fuji HS50EXR & taking Railway photos I just stuck it in sports mode in any weather & light, snapped away & hey presto got a quality photo. Got rid of the camera & upgraded to the Nikon D5300. Stuck it on sports mode take a photo & hey presto loads of noise!! Unless the light is bang on the camera seems to produce noise. Took a photo at Doncaster yesterday of 90029. Light wasn’t brilliant but thought the camera would sort it. Wrong! It turned out grainy. Could someone point me in the right direction as to what I’m doing wrong.