The New Haven transfer at Putnam Junction was discontinued between ETT No. 9 of April 30, 1961 and ETT No. 10 of Oct. 29, 1961. Reference is Special Instruction No. 104 in ETT No. 9 which read in part as follows; Switches, Electrically Locked Switches, Putnam Junction. Harlem Main to New Haven Transfer Tracks controlled from "B" which was Brewster station. That reference was eliminated in ETT No. 10.
Regarding the connection at Dykemans. It is my recollection that the connection was not installed until Conrail came into being because the union agreements prohibited such an arrangement i.e., New Haven crews operating in the territory being discussed. In any event, my Penn Central and Conrail ETT's and General Orders suggest that the connection was installed sometime between General Order No. 720 of April 25, 1976 to Conrail ETT No. 7 and Conrail Northeastern Region ETT No. 1 of June 18, 1978 wherein the connection is listed on page 23, Maybrook Branch.
FYI, General Order No. 719, Effective Sunday, April 1, 1976, to ETT No. 7 of May 19, 1974 stated that the (Penn Central) Northeastern Region (is) now operated by the Consolidated Rail Corporation. My General Orders are not complete from G.O. No. 720 of April 25, 1976 to G.O. No. 733 of April 30, 1978 and there were likely additional ones issued between that date and the effective date of ETT No. 1 of June 18, 1978.