Quoted:
My 0.02c from personal experience, when we had the quakes here that tore our city (pop: 400,000) apart, I was in the middle of town had to hike out (Dressed in office attire I might add)
Immediately after the world stopped going sideways and buildings stopped falling over, the place became a stack more sociable than before, everyone was equally affected, which was literally a conversation point - and everyones priority was more or less the same - get out, get home.
I guess the immediate effect was akin to what media portrays a EMP, cars were all dead stationary(gridlock) no power, phone networks down, no water, no traffic lights, etc.
So getting home was nothing more than a decent hike, I had a bottle of gatorade in my pack, which I ended up sharing with a few folks along the way, ended up averaging 4mph.
It wasn't until about three days later when things started to get interesting as far as things like looters(They stole my motorbike!) and people stealing the generators that were running the cell towers and telco cabinets - if you think it's scary duriing the day, just wait until it's a dark, moonless night in a city with no power.
Interesting post. Something like this is pretty much the only major natural disaster scenario that'd be likely in my area (pretty earthquake prone here in Oregon). I think folks would react similarly to how they did in NZ, certainly wouldn't expect instant Mad Max.
How did the bridges fare in your area? That's the main thing I'd be concerned about around here if there was a massive earthquake. A few downed bridges would shut down traffic and make it very difficult for me to get home.
I live and work in the country, but if I got caught in town when the Big One hit and couldn't drive back I'd have to walk roughly 20 miles. I just got back from an 8.4 mile hike (according to my GPS) along logging roads in steep terrain (~1300 foot elevation gain from lowest to highest point, with a fair bit of up and down). Average moving speed was 3.2 mph with a light pack. Of course, like a dumbass, I forgot my first aid kit and started developing blisters (new boots); wasn't too bad, but another 10 miles of that and I'd really be missing the moleskin.
As for the OP, walking home 10 miles on flat land is an easy walk, as long as you have decent boots and are moderately fit. If I had to hoof it back home, I'd just walk along the road. The only RR tracks that go anywhere near my home run parallel to the highway, so there wouldn't be any reason to follow them (except to cross rivers if the RR bridge is intact). Besides, as others have said, walking on RR tracks is a PITA. I'd follow the big powerline right-of-way that runs a mile or so from my home before I walked along a RR, though it doesn't exactly follow the path of least resistance (cut straight through the mountains around here, so terrain is steep) and there are no bridges across rivers.