Are you primarily interested in a particular aspect of the ACL? (industrial customers with a lot of switching, long distance freights with 4 or 5 unit lashups, locomotive/car service facility, local/long distance passenger service, branchline operations?).
I’m a passenger train fan and, imho, a “must have” book for ACL and SAL passenger modelers is the book “By Streamliner New York to Florida”. Was a birthday present from a good friend. Excellent details on history, type of equipment, etc. Many excellent b&w photos and a few great color shots as well.
The southeast just doesn’t seem to be popular. I just took the Palmetto down to Charleston and somewhere near Rocky Mount, my girlfriend asked me why there were no southern layouts in my magazine. I don’t remember exactly what I told her, but I sure can’t find any Seaboard System or Family Lines covered hoppers on the internet to buy.
As a kid we will go throught Florence SC to get to Myrtle Beach and we had to stop at the yards where i could see the ACL locos and sometimes in Myrtle Beach the bridge will be down ,so nice to see one cross it.
I am also modelling the ACL in th 50s and if your’e looking for prototype locations to model, I would highley suggest Wilmington, NC. This was the railroad’s headquarters until the mid 1950s and would be an excellent location to model as tracks led out of the city in 3 seperate directions, making for a lot of train traffic. I am including Wilmington on my layout and am modelling the line north to New Bern, NC. If you are interested in any more info on this part of the system I would be glad to provide it.
I’ve seen a nice number of south and southeastern themed model railroad layouts and subjects show up in MRR and RMC issues over the past 2 decades.
Bowser has a decent selection of freight cars. Click on each link. When you get to each site, scroll down as on a couple of them there is more than one ACL paint/letter scheme version. It appears that the 1950s era is nicely accommodated. There are also Seaboard Air Line and L&N schemes that would complement your fleet as well. Hope this helps.