Crossing the US Coast to Coast

Brand new to Train Simulations and I currently have Train Simulator 2014 installed. Got it as a Christmas Gift and already a little disappointed by what I saw. I envisioned something along the longs of MS FlightSim where you could load up at Boston and fly to Seattle. Apparently not so in TS2014. I've gone through a lot of the forum postings while awaiting my account activation and from what I have read a Coast to Coast route is not possible by "linking" or merging existing routes with tracks created by me in between.
For instance, I have been looking at extending Sherman Hill from Cheyenne to Laramie (as it exists) on into Rawlins and then beyond over time, with a general heading toward San Francisco over Donner. Looks like I can't link Sherman to Donner according to what I read. Heck, right now I can't even get past the western portals at Laramie.
Just wanted to say hello and see what everyone thinks of my plan.
Randy
For instance, I have been looking at extending Sherman Hill from Cheyenne to Laramie (as it exists) on into Rawlins and then beyond over time, with a general heading toward San Francisco over Donner. Looks like I can't link Sherman to Donner according to what I read. Heck, right now I can't even get past the western portals at Laramie.
Just wanted to say hello and see what everyone thinks of my plan.
Randy