Grand Central Terminal Interlocking Changes

Changes indicated on Locking Sheets (or Dog Chart for Tower A, Section 3) up to 1956. *** is shown for illegible text.

25-Apr-13 C locking Signal 578 added. Locking of 579 revised.
25-Oct-13 B-2 locking Locking account extention ladder "T" to "J" added.
20-Nov-13 B-2 locking Tracks 155, J, 112, 113, 114, Ladder "NA" to Switch 951 Ladder N to switch 953 and Signals 1025, 1080, 1095 added. Signal 869 removed.
20-Nov-13 B-3 locking Tracks 155, J, 112, 113, 114, Ladder "NA" to Switch 951, Ladder N to switch 953 and Signals 1025, 1095, 1080 added. Signal 869 removed.
28-Nov-13 C locking Dwarf signal 632 abandoned.
8-Dec-13 B-1 locking Completion of stages 4 & 5 to tracks 116 & 164.
8-Dec-13 B-2 locking Completion of Stages 4 & 5 to tracks 116 and 164.
8-Dec-13 B-3 locking Completion of stages 4 & 5 to tracks 116 & 164.
16-Jan-14 B-2 locking Eliminated Tracks 183, 184 connections to Ladder U & signals 1094 & 1097 relocated.
15-Apr-14 C locking *** east side of Ladder *** west side of Tracks 50 & 51.
26-May-14 C locking Elimination of track 66, Switch 645 and Signal 622.
25-Sep-14 B-1 locking Revised to show changes 825, 880 and added locking for U-166, 168, 169, 170 and 187-117.
25-Sep-14 B-2 locking Revised to show changes 825, 880 and added locking for U-166, 168, 169, 170 and 187-117.
25-Sep-14 B-3 locking Revised to show changes 825, 880 and added locking for U-166, 168, 169, 170 and 187-117.
25-Sep-14 B-4 locking Revised to show changes 825-880 and added locking for U-166, 168, 169, 170, and 187-117.
3-Mar-15 C locking Elimination of Tracks 12, 78, Signals 600, 623 and Switches 646 + 659
12-Mar-15 B-4 locking Tracks 168, 169 and 170 extended to 117, *** Inner loop in complete. Sigs. 834, 836, 885, *** added.
17-Mar-15 B-1 locking Tracks 168, 169 and 170 extended to 117. West inner Loop in complete. Sig's 834, 836, 883, 885, 1097 & 1100 slotted.
17-Mar-15 B-2 locking Tracks 168, 169 and 170 extended to 117. West inner Loop in complete. Sigs 834, 836, 883, 885, 1097 &1100 Slotted. Signals 902 & 906 added and Signal 817 relocated.
17-Mar-15 B-3 locking Tracks 168, 169 and 170 extended to 117. West inner Loop in complete. Sig's 834, 836, 883, 885, 1097 & 1100 slotted. Signals 902 and 906 added and Signal 817 relocated.
4-Jun-15 C locking Tracks #16 and west transfered to A
12-Jul-15 C locking Regrouping of Levers, Section #2.
2-Aug-15 C locking Signal 539 added.
23-Dec-15 B-1 locking Revised to show track 141 routed to track 106 only. Routes from Tracks 104-5-7 Lad's. T & TA to 141 removed.
23-Dec-15 B-2 locking Revised to show track 141 routed to track 106 only. Routes from tracks 104-5-7, Ld's. T & TA to track 141 removed.
31-Jan-16 B-1 locking Revised to show as per tracing prior to revision 6.
31-Jan-16 B-2 locking Revised to show as per tracing prior to revision 7.
1-Jun-16 A-1 locking Revised to show lever 226 out.
15-Aug-16 C locking Signal 538 moved south.
28-Aug-16 A-1 locking Revise to show signal 220 removed.
8-Feb-17 B-1 locking Dwarf signals 801-745 added. Double switch levers 786 & 787 made single switch levers.
8-Feb-17 B-2 locking Dwarf signals 801-745 added. Double switch levers 786 & 787 made single switch levers.
12-Nov-17 B-4 locking To cover addition of tracks 165-166-167.
16-Nov-17 B-2 locking To cover addition of Trks. 165-166-167.
16-Nov-17 B-3 locking To cover addition of tracks 165-166-167.
23-Jan-18 A-3 dog To cover addition of Track 39.
23-Jan-18 A-4 locking To cover addition of Track Nº 39
1-Feb-18 B-1 locking Signals 753, 816, 909, 986, 899 + 980 on Tracks 150, 154 + 160 relocated.
1-Feb-18 B-2 locking Signals 753, 816, 909, 986, 899 + 980 on Tracks 150-154+160 relocated.
1-Feb-18 B-3 locking Signals 753, 816, 909, 986, 899 and 980 on Tracks 150-154 + 160 relocated.
1-Aug-18 A-4 locking *** Tracks 40 to 42 + 98, Ladders X + Z
12-Aug-18 A-3 dog ***
27-Jan-19 C locking Revised as per field information. 621 Added.
7-Nov-19 B-3 locking To cover addition of Tracks 123-124-125.
8-Nov-19 B-4 locking To cover addition of Tracks 123-124 & 125.
17-Aug-21 B-3 locking Revised to cover removal of construction Track.
18-Aug-21 B-4 locking Revised to cover removal of Construction Track.
11-May-22 B-3 locking Revised to show addition of Construction Track-Ladder U.
11-May-22 B-4 locking Revised to cover addition of Construction Track-Ladder U.
18-Oct-23 C locking Signals 578 & 579 relocated. Signal 589 abandoned. Sw 5?? relocated.
2-Nov-23 A-1 locking Levers 233, 249, 251, 274, 277, 279, 288, 289, 290 revised due to changes in Ladder "P" and Track #22.
18-Jan-24 A-4 locking Changes due to Installation of Signal #483.
21-Aug-24 B-3 locking Additional Locking installed to cover Tracks 118 to 122.
21-Aug-24 B-4 locking Revised to cover addition of Tracks 118 to 122.
1-Mar-27 A-4 locking Track "H" changes. Sig. 450 added.
3-Mar-27 A-3 dog Track "H" Changes.
14-Apr-27 C locking Signal 593 installed. Ladder "M" Locking revised.
24-May-27 C locking Locking for Dwarf Signal #526 added.
9-Apr-28 B-2 locking Locking on 842 revised as per changes in Field.
25-Jul-28 A-3 dog Addition of Sig. #411.
26-Oct-28 A-1 locking Locking revised due to elimination of Track #80.
27-Oct-28 A-3 dog Signal #373 added.
7-Oct-29 A-1 dog New Sig. 293 installed. Locks 280 Reverse when 281 is Normal.
7-Oct-29 A-2 locking Dwarf Sig. 293 installed.
22-Jan-30 C locking Elimination of Track 58, Switch 566 & Signal 581.
5-May-30 B-1 locking Revised to show changes acc't. 200 Track.
18-Jun-30 A-3 dog To cover moving of Sig. 387.
19-Feb-31 B-1 locking 798 w 799 x (800) eliminated acct. relocation of Sig. 798 and elimination of Trk. Cir. T-A as in service Feb. 13, 1931 per O.K. installed plan 3-2, Sec. 1 dated Feb. 13-1931.
24-Apr-31 A-1 locking 266 x 248 (248) eliminated account of relocation of dwarf signal 266 46 ft. west April 24, 1931 per Signal Engr's. letter of April 29, 1931.
6-Nov-31 A-1 locking Revised to show work as in service October 21, 1931 per Inspector's field check and J.J.C.'s memo of November 6, 1931.
9-Nov-31 A-2 locking Revised to show work as in service October 21, 1931 per Inspector's field check and J.J.C.'s memo of November 9, 1931.
9-Nov-31 A-3 dog Revised to show work as in service October 21, 1931 per Inspector's field check and J.J.C's. memo. of Nov. 9, 1931.
9-Nov-31 A-4 locking Revised to show work as in service October 21, 1931 per Inspector's field check and J.J.C's memo. of November 9, 1931.
11-Dec-31 B-1 locking 737 x 798 added Oct. 31, 1931.
7-Jan-32 U locking Redrawn from U-41. Shows locking as found in service, per Inspector's plan.
28-Jan-32 B-1 locking Shows locking as found in service per Inspectors' plans of Nov. 17, 31.
28-Jan-32 B-2 locking *** in service per Inspectors' plans of Nov. 17,'31.
28-Jan-32 B-3 locking Shows locking as found in service per Inspectors' plans of Nov. 17,'31.
28-Jan-32 B-4 locking Shows locking as found in service per Inspectors'plans of Nov. 17,'31.
16-Feb-32 A-3 dog Revised account of addition of Signal No. 421.
27-Feb-32 C locking As in service per Inspector's marked print dated 9-21-31.
9-Mar-32 B-3 locking Signal 1091 eliminated and signals 1084 & 1087 routed over Track 127 per Inspector's "Installed as Shown" plan dated 3-3-32.
9-Mar-32 B-4 locking Signal 1091 eliminated and Signals 1084 & 1087 routed over Track 127 per Inspector's "Installed as shown."
10-Jun-35 C locking Signals 539 and 569 eliminated 3-18-35.
10-Oct-36 A-1 locking Signal 226 added to increase capacity of tracks 18 or 19. Placed in service Aug. 28, 1936.
23-Feb-37 A-3 dog Revised to show work as in service 8-22-36.
20-Apr-38 U locking 37 W (46) x (25). Placed in service 1-27-1938.
4-Nov-38 A-1 locking Signal 230 added. Placed in service 10-5-38.
6-Dec-38 B-2 locking *** of platforms between tracks 107-108 and 109-110. Placed in service 12-6-38.
27-Dec-38 B-1 locking Shows changes acc't extention of platforms between tracks 107-108 and 109-110. Placed in service 12-6-38.
27-Dec-38 B-3 locking Shows changes acct. extention of platforms between Tracks 107-108 and 109-110 placed in service 12-6-38.
22-Mar-39 B-3 locking Signal 905 renumbered 910. New Signal 905 installed 75 ft. in advance of Switch 950. Placed in service 3-17-39.
20-Jan-42 B-4 locking Crossover 1067-1068 & Signal 1093 eliminated. Placed in service 6-18-41.
29-Jul-43 A-1 locking Levers 191 to 200 shown to agree with machine tabulation.
29-Jul-43 C locking Levers 646 to 685 removed to agree with machine tabulation.
25-Oct-43 A-1 locking Signal 220 added. Placed in service 10-20-43.
14-Nov-44 A-1 locking 218 - 219 x 232 removed. 218 - 219 W (235) x 232 placed in service 11-18-43.
19-Aug-46 A-3 dog 412 w 407 x (375) added 2-27-46.
28-Mar-47 A-2 locking Signal 329 renumbered 343, Signal 330 renumbered 344, Signal 331 renumbered 330 and Signal 331 added. Placed in service 3-24-47.
28-Mar-47 A-3 dog Signal 329 renumbered 343, Signal 330 renumbered 344, Signal 331 renumbered 330, and Signal 331 added. Placed in service 3-24-47.
15-Dec-49 A-4 locking Revised to show 469 w 463 x 461 and 482 x 461. Placed in service 5-3-49.
15-Dec-49 U locking Locking changes for Revision 3 interlocking plan 8247, and locking changes for wide car clearances. Placed in service 6-5-49 and 5-3-49.
25-Mar-54 A-1 locking Lever 230 x 239 (239) added. Placed in service 12-17.53.
12-Oct-56 U locking Sig. 60 made repeater of sig. 31, 9-13-55.