A long post, but you hit my local knowledge button
Greene's book was written years ago, so some of his landmarks and roads have changed or morphed into something else, but yes you can pretty much following the trail with his directions.
A lot of the Lambshead is county roads
not as many gates as you would think, quite a few cattle guards on some roads. There's people other than the Matthews people that have to get access to their properties across their place. If you can get you a decent map with all the roads, or have GPS and follow the roads you should be okay, but obviously a little permission and directions from somebody would always be better. If you can't find somebody at the Ranch, call the Albany Chamber
Ask about access to and look for the Old Stone Ranch House, not really a Butterfield location, but an unbelievable restored mid 1850's ranch house in the middle of Lambshead. Not too far from there, and tougher to get access to (its across the river on somebody else's land) is the site of Camp Cooper. The Stone Ranch house is way cooler than any of the other spots around here and access to the inside of the house will be one of the highlights of your trip if you can find somebody let you in. Camp Cooper is a plowed field and Clear Fork Station is I don't think much better, maybe a foundation or chimney rock or two.
http://www.tshaonline.org/handbook/online/articles/OO/apo3.htmlbut before you get to Albany,
run by Fort Richardson, it was post Butterfield in time period, but it is a really neat Fort with some very well restored quarters and Hospital - State Park with minimal fee
Between Ft Richardson and Belknap about 8 miles north of Graham is the site of the Warren Wagon Train massacre and Brit Johnson's last stand.
Both on the old Military road which followed the original Butterfield
Warren -
http://www.tshaonline.org/handbook/online/articles/WW/btw3.htmlBrit
http://www.tshaonline.org/handbook/online/articles/JJ/fjo7.htmlboth locations are on the Salt Creek Prairie
"the most dangerous prairie in Texas"
http://www.tshaonline.org/handbook/online/articles/SS/ryseu.htmlFort Belknap is really disappointing for most visitors, its been converted into a community center and looks very unlike its Fort ancestry...
but across the highway from Fort Belknap, down what looks like a turnrow in a grove of trees is the site of the old Fort Belknap cemetery
that makes it worth the stop - not really well marked, but see if you can find that location
Fort Griffin wasn't there during Butterfield, but it too is worth a quick stop - checkout the flats on the river just northeast of the fort, you'll actually cross the river on the highway and see the flats on your right before you get to the Fort (assuming you're coming from the northeast end of the trail going west)Ft Griffin was a pretty rough part of old west history.
after Lambshead see if you can time it to schedule a meal in Albany...lunch is okay, but supper is better at the Beehive and Albany Mercantile
the route to Fort Phantom crosses a bunch of private ranch land thats now covered with wind turbines, but 180 west to FM600 will bring you down to Ft Phantom from the north. Fort Phantom was there during the Butterfield. There are now a couple of restored buildings and lots of foundations, but it is the iconic lonesome chimneys that make it worth at least a drive by.
quick advertisement here for Frontier Texas! in downtown Abilene - tells an excellent version of the Brit Johnson story and the Elm Creek raid story in a really fancy multi-media presentation -
there's a couple of hiway makers, one north of Abilene and one west at about Tye on I-20, but all they say is Butterfield passed nearby.
before you leave Fort Phantom, if you can find a view point to see west, look west and south, I think you can see the old Pride oil refinery, about 2 miles south of that is where the trail crosses hiway 83/277. It then trends southwest to Castle Peak which looks a little like a tit or nipple on the end of one of the legs of the divide. This is one of the few places open enough in this area to actually see the ground for quite a distance between where you are and where the trail goes of into the distance
next quick stop would be around Castle Peak south of Merkel up Mountain Pass - there was a stage station in the pass, the pass and station drew a bit of attention from the local wild indians. Of course the dirt road up the pass now is not as steep and narrow, and it really only rises 150 feet or so, but it was quite the obstacle back in the day....later travel went up I think its called Owl Gap which is about 5 miles east following roughly the route of Hiway 277
Along this escarpment or caprock looking land feature called the Callahan Divide is supposedly the eastern end of the Coronado's trip before he turned north to Kansas - whether thats true or not, I don't know, but they say the journals and diaries talk of wild grapes found along a landscape feature like the divide, and along in here is one of the only places this far west where that occurred. Back in the 40's Abilene had a billboard on the highway that said something like "15 miles west of this location, Coronado had intercourse with the Indians"
From Mountain Pass you run down to Fort Chadbourne, some of the dirt roads do a pretty good job of following down through Happy Valley and then on to the Fort Chadbourne ranch.
WHATEVER YOU DO, MAKE SURE YOU STOP AT CHADBOURNE.in fact, call Garland Richards and see if they will be there. He owns the joint, fort and ranch.
http://www.fortchadbourne.com/If you can get him to show you some of his artifact collection found at the Fort, this will be the highlight of your trip, screw that rock house. Check out the Fountain House graffiti and the newly restored double officer's quarters. They are in the process of restoring the Butterfield station house that was located behind one of the Barracks buildings. (Congratulate them on their million dollar bequest they recently received) Even if you don't get them on the phone, drive through the grounds on your way to San Angelo/Grape Creek and beyond.
That's my section of the trail
I want to find horsehead crossing on the Pecos sometime. Never been to that. We did the route over to Guadalupe peak and Pine something station there at the Mountain. Pine Springs. and then onto El Paso. Some other time or extend it if you can, run over to old Mesilla at Las Cruces and eat at La Posta on the square, not that good of food, but the actual building was a stage stop on the Butterfield. and as others said above a few more miles west and the dirt road trip up over Apache Pass was pretty cool too.
that is my expert Butterfield guide tour book
print it out
call me if you get lost