I remember when I was a kid living out that way the I.P and The Alice used to stop at more stations than now. Their Orange stop was at the East Fork. I don’t know the logic of building the main station off the interstate line. Maybe because it is close to the CBD, maybe because when it was built more traffic used the Dubbo line
The Main Western Line from Sydney reached Orange in 1877, then Wellington in 1880, and eventually Bourke in 1885.
Orange Station was built close to the middle of town as was usually the case.
The then "Branch" from what is now known as East Fork Junction towards Broken Hill reached Molong from Orange in 1885, Parkes in 1893, and Broken Hill in 1927.
There are plenty of more sensible ways to spend a Billion or so on the Railways.