By popular demand, following is a complete list of the original station platform lengths of the IND grouped by chaining codes, as reprised from over several posts earlier this year. Since that time, some additional information was discovered by this writer. Without further adieu:
WASHINGTON HEIGHTS - 8th AVENUE – Original 1932 Route:
207th Street (Manhattan) : start 1534+45, end 1541+05
Dyckman-200th Street : start 1512+15, end 1518+75
190th Street-Overlook Terrace : start 1481+05, end 1487+65
181st Street : start 1454+20, end 1460+80
175th Street-George Washington Bridge Bus Station : start 1436+15, end 1442+75
168th Street-Broadway : start 1410+20, end 1416+80
163rd Street-Amsterdam Avenue : start 1393+35, end 1399+35
155th Street : start 1372+45, end 1378+45
145th Street : A1,2,3,4 - start 1350+15, end 1356+75; C1,2/4,3 - start 1350+15, end 1356+75 [C1 sidewall design end 1356+15]
135th Street : start 1323+15, end 1329+15
125th Street : start 1295+15, end 1301+75 [A1 sidewall design end 1301+15]
116th Street : start 1271+15, end 1277+15
110th Street-Cathedral Parkway : start 1252+35, end 1258+35
103rd Street : both platforms [A1 & A2] start 1233+65, end 1239+65
96th Street : both platforms [A1 & A2] start 1215+15, end 1221+30
86th Street : both platforms [A1 & A2] start 1191+15, end 1197+15
81st Street-Museum of Natural History : A1 platform start 1172+45, end 1178+45; A2 platform start 1172+45, end 1178+75
72nd Street : both platforms [A1 & A2] start 1148+45, end 1154+45
59th Street-Columbus Circle : start 1117+95, end 1124+55
50th Street [8th Avenue] : A1 platform start 1095+15, end 1101+85; A2 platform start 1095+15, end 1101+80; D3 & D4 platforms start 1092+30, end 1098+90
42nd Street [8th Avenue] : A1/A3 platform start 1069+00, end 1075+60; A2/A4 platform start 1074+55, end 1081+15
34th Street-Penn Station : A1 & A2 platforms start 1050+80, end 1057+40; A3 platform start 1051+25, end 1057+85; A4 platform start 1051+85, end 1058+45
23rd Street [8th Avenue] : start 1024+45, end 1031+05
14th Street [8th Avenue] : start 1003+55, end 1010+15
West 4th Street-Washington Square : A1/A3 platform start 969+25, end 975+85; A2/A4 platform start 969+25, end 976+05; B1,2,3,4 platforms start 959+00, end 965+60 [southernmost B platforms commence 90 ft. north of start of southernmost A platforms; i.e. B_ 961+00 = A_ 972+15]
Spring Street : start 945+50, end 952+10
Canal Street-Holland Tunnel : A2/A4 platform start 923+90, end 930+50; A1/A3 platform start 926+10, end 932+70
Chambers Street station : start 898+25, end 904+85
World Trade Center terminus [formerly, Hudson Terminal] : start 892+00, end 898+70
CRANBERRY STREET TUBES:
Broadway-Nassau Street : start 879+00, end 885+60
High Street-Brooklyn Bridge : A3 start 814+40, end 821+00; A4 start 815+00, end 821+60 [And yet this is an island platform which begins and ends at the same points. Go figure]
Jay Street-Borough Hall : start 782+45, end 789+05
GRAND CONCOURSE LINE and connection from 59th Street-Columbus Circle to Sixth Avenue line:
205th Street : start 1651+60, end 1658+20
Bedford Park Boulevard : start 1618+95, end 1625+55
Kingsbridge Road : start 1589+60, end 1596+20
Fordham Road : C1/C3 platform start 1565+85, end 1572+55; C2/C4 platform start 1566+25, end 1572+85
182nd-183rd Street : start 1545+30, end 1551+90
Tremont Avenue : start 1521+55, end 1528+15
174th-175th Street : start 1499+70, end 1506+45
170th Street : (approx.) start 1473+95?, end 1480+65?
167th Street : (approx.) start 1448+50?, end 1455+10?
161st Street-River Avenue : start 1415+00, end 1421+60
155th Street-8th Avenue : start 1378+15, end 1384+75
Seventh Avenue-53rd Street : B3 start 1087+35, end 1093+95; B4 start 1087+40, end 1094+00; D3 & D4 start 1110+10, end 1116+70
PROSPECT PARK LINE:
Bergen Street : start 756+82, end 763+42 [NOTE: Only for local platforms; no info on express platforms]
Carroll Street : start 732+40, end 739+00
Smith-9th Street : B1 platform start 705+10, end 712+15; B2 platform start 705+10, end 712+30
Fourth Avenue : B1 platform start 683+85, end 690+90; B2 platform start 684+10, end 690+90
[NOTE: Tracks go back underground at 683+85]
Seventh Avenue (Brooklyn) : start 654+02, end 660+57
15th Street-Prospect Park : start 625+70, end 632+30
Fort Hamilton Parkway : start 585+40, end 591+95
Church Avenue : start 556+95, end 563+55
QUEENS BOULEVARD LINE:
179th Street : D2/4 platform start 1766+85, end 1773+45; D1/3 platform start 1767+00, end 1773+60
169th Street : start 1738+65, end 1745+25
Parsons Boulevard : start 1709+70, end 1716+30
Sutphin Boulevard : start 1687+55, end 1694+15
Van Wyck Boulevard : start 1650+95, end 1657+55
Union Turnpike-Kew Gardens : start 1614+05, end 1620+65
75th Avenue : start 1591+35, end 1597+95
71st-Continental Avenue - Forest Hills : start 1567+85, end 1574+45
67th Avenue : start 1539+40, end 1545+40
63rd Drive : start 1512+15, end 1518+15
Woodhaven Boulevard-Slattery Plaza : start 1487+05, end 1493+75
Grand Avenue-Newtown : start 1459+85, end 1466+45
Elmhurst Avenue : start 1435+60, end 1441+60
Roosevelt Avenue-Jackson Heights : start 1405+30, end 1411+90
65th Street : start 1382+60, end 1389+20
Northern Boulevard : start 1358+90, end 1365+50
46th Street : start 1335+10, end 1341+70
Steinway Street : start 1309+75, end 1316+35
36th Street (Queens) : start 1278+06, end 1284+66
Queens Plaza : start 1250+05, end 1256+65 [D2 sidewall start 1250+55]
23rd Street-Ely Avenue : start 1224+75, end 1231+35
Lexington Avenue-53rd Street : start 1149+90, end 1156+50
Fifth Avenue-53rd Street : D4 start 1130+44, end 1137+44; D3 (approx.) start 1130+20, end 1137+10
BONUS: World’s Fair : start 102+17, end 108+29
HOUSTON STREET / RUTGERS SLIP TUBES:
Broadway-Lafayette Street : B1/3 (approx.) start 922+25, end 928+65; B2/4 (approx.) start 922+40, end 928+95
Second Avenue : start 903+50, end 910+00
Delancey Street : start 880+30, end 886+90(?)
East Broadway : start 861+55, end 868+15
York Street : start 808+80, end 815+40
FULTON STREET LINE:
Court Street : start 781+45, end 787+45
Hoyt-Schermerhorn Street : start 761+75, end 768+45
Lafayette Avenue : start 729+85, end 736+45
Clinton-Washington Avenue(I) : A1 start 704+15, end 710+75; A2 start 704+45, end 711+05
Franklin Avenue : A1 start 678+00, end 684+65; A2 start 678+45, end 685+05
Nostrand Avenue : all platforms [A1,2,3,4] start 659+65, end 666+25
Kingston-Throop Avenue : A2 start 632+20, end 638+80; A1 start 634+60, end 641+20
Utica Avenue : start 605+80, end 612+40
Ralph Avenue : start 578+35, end 584+95
Rockaway Avenue : A1 start 552+95, end 560+03; A2 start 553+22, end 556+05
Broadway-East New York : A2/4 start 534+95, end 541+35; A1/3 start 534+95, end 541+40
Liberty Avenue : start 502+35, end 508+45
Van Siclen Avenue : start 479+07, end 485+16
Shepherd Avenue : start 452+13, end 458+28
Euclid Avenue : start 427+55, end 433+70
[NOTE: Around 420+00, A code becomes K]
Grant Avenue : start 406+50, end 413+10
BROOKLYN-QUEENS CROSSTOWN:
Court Square : start 1230+07, end 1236+67
Van Alst-21st Street : start 1211+32, end 1217+92
Greenpoint Avenue : start 1157+72, end 1164+32
Nassau Avenue : start 1131+52, end 1138+32
Metropolitan Avenue-Grand Street : start 1084+77, end 1091+37
Broadway (Brooklyn) : start 1060+52, end 1067+12
Flushing Avenue : start 1039+42, end 1046+02
Myrtle-Willoughby Avenue : start 1017+47, end 1024+52
Bedford-Nostrand Avenue : start 989+22, end 995+82
Classon Avenue : start 970+82, end 977+42
Clinton-Washington Avenue(II) : start 951+82, end 958+42
[NOTE: Inbetween this and the next station, they pick up the numeral order of the Fulton Street route]
Fulton Street : E2 start 733+55, end 740+15; E1 start 733+70, end 740+30
SIXTH AVENUE LINE:
47th-50th Street - Rockefeller Center : start 1067+75, end 1074+40
42nd Street [6th Avenue] : start 1049+10, end 1055+80
34th Street [6th Avenue] : B2/4 start 1029+70, end 1037+15; B1/3 start 1030+85, end 1037+70
23rd Street [6th Avenue] : both platforms [B1 & B2] start 1002+30, end 1009+00
14th Street [6th Avenue] : B1 start 982+85, end 989+50; B2 start 983+35, end 989+95
POSTWAR EXTENSIONS:
Connecting from Sixth Avenue-Houston Street route to Manhattan Bridge:
Grand Street : start 888+05, end 894+20
63rd Street line:
57th Street [6th Avenue] : start 1090+50, end 1096+65 [at station end, B5/6 chaining code becomes T1/2]
Lexington Avenue-63rd Street : T2 start 1130+30, end 1136+95; T1 start 1130+50, end 1136+95
Roosevelt Island : start 1173+55, end 1179+70
21st Street-Queensbridge : T2 start 1205+30, end 1211+45; T1 start 1205+50, end 1211+60
Archer Avenue extension:
Jamaica Center-Parsons/Archer : DA1, J1/2 start 76+00, end 82+30; DA2 start 76+00, end 82+25
Sutphin Boulevard : all start 57+65, end 63+80
Jamaica-Van Wyck : start 26+20, end 32+35
[NOTE: DA1 76+00 = 1726+00?; J1 76+00 = 670+60?]