All the drawings are drawn using the scale of 45 pixels per meter. (142 pixels = 3.1m in precise)
Well, I’m not the one who want to draw something using a strange scale. The very first batch of drawings in this site (in about 1999)were not drawn by me but Danville, who is the first one who publish railway drawings on the internet in Hong Kong (his site was closed less than 1 year before foundation of this site, unfortunately). Then the same scale was adapted in other drawings until now.