Hi Luuckyy
The whole scene is obviously made up of many models, for my part it's just the signal box.
The texture is a simple flat image (1024x1024) which I suppose could actually be ½ that size. I've attached a link for you, the use of sorface area is pretty poor and I should have spent a bit more time rationalising the UV map as it now looks a bit sloppy.
https://tinyurl.com/nhcxbtda
Tony