According to:
http://www.trains.com/TRC/CS/forums/32/ ... wPost.aspx
1 DOUBLE BEDROOM 1 MASTER ROOM BUFFET 22 SEAT LOUNGE 10 SEAT LOUNGE OBSERVATIONS Pullman Standard May 1938 Plan: 4079 Lot: 6547 (Built for and assigned to 1938 TWENTIETH CENTURY LIMITED)
BEDLOES ISLAND
MANHATTAN ISLAND
PELEE ISLAND
THOUSAND ISLANDS
The RIVER series Observations were assigned to the TWENTIETH CENTURY LIMITED for the duration of WW II while the ISLAND series observations built for the TWENTIETH CENTURY LIMITED were stored for the duration of the war.
With the addition of the 1940 lightweight streamlined sleeping cars this gave the NYC 138 total at the beginning of WW II. Of those 134 performed yeoman service for their owner during the war while the Four ISLAND series Sleeper Lounge Observations were stored. In July 1946 the Four ISLAND series cars were rebuilt by Pullman into 4 Double Bedroom Buffet 26 seat Lounge Observations. At that time they were returned to the TWENTIETH CENTURY LIMITED, with the RIVER series Sleeper Lounge Observations then being returned to the SOUTHWESTERN LIMITED. Beginning September 15, 1948 a new TWENTIETH CENTURY LIMITED entered service between New York and Chicago the ISLAND series cars were then assigned to the ADVANCE COMMODORE VANDERBILT and COMMODORE VANDERBILT. The new 1948 TWENTIETH CENTURY LIMITED editions were assigned new CREEK series sleeper Lounge Observations.
In 1948 PELEE ISLAND and THOUSAND ISLANDS were assigned to the COMMODORE VANDERBILT. The other two ISLAND series cars were held as back ups at Chicago and New York for a second section of the COMMODORE VANDERBILT or TWENTIETH CENTURY LIMITED or as a replacement for the regularly assigned cars to these trains. All four cars were assigned 5-digit numbers in 1952 retaining their names as well. The numbers were as follows:
10640 BEDLOES ISLAND
10641 MANHATTAN ISLAND
10642 PELEE ISLAND
10643 THOUSAND ISLANDS
The NYC retired all four ISLAND series Observations in 1960 and sold three to the NdeM for further service.