To answer Bill’s question above:
The local freight numbers were relatively consistent from year-to-year. For example, in every year I have an Arranged Freight book, the Hartford-New Hartford local is HDX-5 if there was one at all (in some years HDX-5 is not used).
This was the only local running through New Britain to Plainville (and up to New Hartford).
In some years, such as 1951, this train also did the Hartford Griffins run (Tuesday, Thursday) and only went as far as Plainville that day on the Highland working New Britain and Plainville too.
In 1948, HDX-9, a Monday, Wednesday, Friday job from Hartford to East Longmeadow worked the Griffins line instead. The 1951 HDX-9 only did the East Longmeadow run, still Mon, Wed, Fri.
Another example, PDX-1 in 1948 worked Cedar Hill to New London, and PDX-2 New London to Cedar Hill, connecting in Saybrook, generally working opposite towns, with PDX-2 going up the Valley to East Haddam.
By 1951, PDX-2 was vacant, PDX-1 is Cedar Hill to Essex, and PDX-5 is New London to Jewett City and Saybrook, instead of New London to Plainfield. Plainfield is worked by PDX-6 in both years.
Those differences would lead me to believe that traffic patterns had changed, requiring them to adjust schedules.
Of course, when divisions were eliminated, such as the Hartford division c1953, many trains had to be adjusted. In 1951 there were 14 New Haven division locals (and #14 was vacant). In 1953 there were 30, and the New Hartford local is now NX-25. This also appears to be when they dropped the “D” from the local symbol.
Also, in response to earlier posts, the Arranged Freight books often listed the New Haven named trains, such as Maine Bullett, Speed Witch, etc. it doesn’t often list names for locals, but in the ‘48 book NHDX-13 has the notation (brick extra). So it does occassionally note them too.
Modeling the New Haven Railroad 1946-1954 | https//:blog.newbritainstation.com