It really feels like sims of railroading (As a company not as a engineer) peaked with Railroad Tycoon 3 over 20 years ago. Since then the only stuff thats came out that ive seen has been Sid Miere's Railroads then the two transport fever games which are a little more in depth Re signaling but overall a bit less fun for it. Granted we have better technology now but i think the market for buisness sims dried up a bit. While i have seen a bit of railway empire i dont exactly think its as good as the railroad tycoon games but im not sure. 

(Also hope this isnt off topic or too unserious for discussion)