My references indicate:
In 1964, train # 7 "The Wall Street Special" was a Monday morning train from Montauk to Jamaica with 4 parlor cars plus coaches.
On Tuesday September 8, 1964 (day after Labor Day), train # 7 operated with 5 parlor cars in the consist:
2036 ONEIDA CLUB
2044 NOYACK
2029 MANHASSET
2014 AMAGANSETT
2025 COMMACK
On Monday August 22, 1966, train # 7 operated with 5 parlor cars in the consist:
2039 NESCONSET
2030 MINEOLA
2022 ISLIP
2037 TUSCARORA CLUB
2013 PECONIC
On Tuesday September 3, 1968 (day after Labor Day), train # 7 operated with 5 parlor cars in the consist:
2013 PECONIC
PRR 8135 JUNIPER FALLS (lightweight 6 double bedroom lounge)
2043 MATINECOCK
2015 CUTCHOGUE
2016 MATTITUCK
On Tuesday September 2, 1969 (day after Labor Day), train # 7 operated with 4 parlor cars in the consist:
NH 503 CITY POINT (lightweight 14 roomette 4 double bedroom sleeper)
PRR 8137 MAPLE FALLS (lightweight 6 double bedroom lounge)
NH 509 LONG POINT (lightweight 14 roomette 4 double bedroom sleeper)
NH 506 GOSHEN POINT (ditto)
and coach cafe car 8552.
The recently acquired lightweight cars used in parlor car service would eventually get LIRR numbers and names.
On Monday July 27, 1970, train # 7 operated with 2 parlor cars in the consist:
2037 TUSCARORA CLUB
2063 PINE FALLS (lightweight 6 double bedroom lounge)
and coach cafe car 8552.
On Tuesday September 7, 1971 (day after Labor Day), train # 7 operated with 4 parlor cars in the consist:
2037 ONTEORA (rebuilt from heavyweight TUSCARORA CLUB)
2062 WYANDANCH
2052 PATCHOGUE
2066 MATTITUCK
and coach cafe car 8552.