In the late '40s the New Haven Railroad began taking deliveries of new stainless steel streamlined passenger equipment. None of this equipment ran on the Highland line. Instead, it was a mix of heavyweight and streamlined light weight (American Flyer) cars. At this point I am only referencing passenger equipment that would be found on the Highland Line.
There were no sleepers on any of the Highland Line passenger trains. An occasional diner or more likely a grill car appeared on special trains like the Narrangasset Race Specials. There was a lot of mail and express traffic, however.
Head End
2760-2766, 2768-2772: 60' Baggage and Mail (30')
2780-2789: 60' Baggage and Mail (30')
2790-2794: 60' Baggage and Mail (15')
Assigned: 131/136
3800-3946: Baggage
Heavyweight
600-658: Converted Parlor Coach (CvP)
These paired-window coaches were rebuilt from 2000-series parlor cars specifically for commuter service on several lines, including the Highland. All of the cars have 88 seats, except 601, 607, 609, 610, and 611 with 84 seats.
In the Shoreliner article there are two plans shown. These were converted from at least 5 different parlor car plans. In addition, the window spacing on plan 9401 in the article does not match that in the photographs.
6800-6823 Deluxe Smoker
8100-8104, 8107-8139, 8151 Coach
Light Weight
The New Haven Railroad started taking delivery of new streamlined light weight passenger cars. These were built by Pullman Standard at their Osgood-Bradley plant with a low-profile riveted construction and turtle roofs giving them a smooth, streamlined profile. They are commonly known as "American Flyer" cars, because of a line of S-gauge model trains marketed by the AC Gilbert Company of New Haven, CT.
These were the last passenger cars added to the roster until after World War II and the delivery of the stainless steel streamlined passenger cars.
8200-8249: Coach
8250: Coach
8252-8269: Coach
8270-8299: Streamline coach (SL)
Assigned: 421, 463
8300-8349: Coach
8350-8369: Coach
8370-8374: Coach
8500-8529: Streamline reclining seat lounge coach (SLrL)
Assigned: 128, 129, 131, 136
Resources
On the rear cover of Shoreliner magazine (Vol 30, No. 2) is a picture of Business Car #1 (The Yankee) taken October 30, 1954 in Plainville. In one of the Arcadia Books is another picture of Business Car #1 (based on the railing) at New Britain Station.
Shoreliner
Volume 21, Number 3
pg 8, "Butterflies to Caterpillars."