Then we don't need quota for particular State. Everyone should get equal opportunity everywhere in the Country (even world). What trump does? Best example is trump. The person always say "only US citizen should get job in US" and creating problems for outsiders.
Apart from it, check out and calculate the ratio of Number of people to the density of the railway in that particular State. This may help you to know how it may be injustice to some states and good for some states. Like UP and Bihar has maximum population of our country and luckily they also have maximum railway but if you talk about KK(suppose) or take example of MH, just calculate the population and density of...
more... the railway in your own state. Is that perfect ratio for these states?
Moreover, Railway is a transportation system of our country not of any particular State, zones are divided for better work, control. this zonal system also in every sectors weather it is aviation sector, bank etc. But it's our nightmare that our greedy politicians demanding state wise zones. Isn't it discrimination? By dividing people by their language, religion, states in this way?
For getting job, every state govt and central govt do many thinks like many kinds of yojas unless state govt have any greedy politicians. As you said, States inviting many investments is also a part. So do what states are doing cuz it's good. But railway is a part of Central Govt not any State govt. So no need of quota system. Let it be. Railway already destroyed by many greedy politicians.