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Drawing number ranges

Contents

The tables below are primarily concerned with the number ranges for drawings; in many cases these are the same ranges as for other sheets such as material lists. For some organisations (especially Milliken Brothers and Blaw Knox), these number ranges are also the design contract numbers for the towers. For line contracts, see the contracts page.

Milliken Brothers and Blaw Knox

Erection diagram numbers are placed into a range with the same number as the contract, e.g. the K5735 erection diagrams are all numbered in the K5735 range. General arrangement diagrams are placed into a separate drawing number range with (typically) an XM prefix. Combined general arrangement and erection diagrams also use the XM range. The exact reason for the two number ranges is not known, likewise the different numerical orders of the two ranges in early years. The most recent types typically use the same number for T and XM and don’t follow any apparent sequence. The older LT numbering ranges appear to have contained the year as the final two digits of the range.

Contract number Year(s) Coverage XM series Notes
L134 1927 Milliken L134 ?
L145 1928 CS PL1 L145 L145 used for all known drawing types
T161 1929 CE PL1 ?
T163 1929 Milliken T163 LT629
T169 ? Milliken T169  LT429 County Antrim 33 kV lines
E102 1929–31 Milliken E102 LT1929
E112 1929–33 NWE PL1 LT530
E136 1929–31 NEE PL1 LT2830
E111 1930–32 NWE PL2 LT630
E141 1931–32 SWE PL1 LT3630
E142 1929–31 EE PL1 LT231
E164 1932 SS PL1 ?
E177 1932–3 Milliken E177 XM911
K721 1934 Blaw Knox K721 XM1077
K1373 1935–38 Blaw Knox K1373 XM1180
K1535 1935–37 NWE SL4 XM1266
K1576 1936 Blaw Knox K1576 XM1284 Spey Valley Extension (Tummel Bridge–Keith)
K1611 1936–37 CE PL3 XM1276
K1857 1936–37 CE PL4 XM1317
K2695 ? NWE SL2A XM1436 Only contains cables and sealing ends for the D3
K4611 1939 Blaw Knox K4611 XM1631 Continuation of K1373
K5257 ? Preston Corporation ? ?
K5297 1940 WGR single circuit XM1692 XM range almost certain, but unproven; used by SWE PL9
K5735 1940–41 NWE PL7 XM1742 Only DD2 to DD90 recovered
K5784 1940, 1967 War Time Grid XM1746 Only DDT90 (1940) and DDT90 auxiliary crossarms (1967) drawings recovered; most number ranges omitted due to lack of K/XM pairing
K6235 ? “PL4” XM1772 Gloucester–Ebbw Vale
? XM1775 Carlisle–Distington
? XM1783 Ocker Hill–Nechells
? XM1809 Bedford–Little Barford
? XM1827 Upper Boat substation
? XM1821 Padiham
? XM1848 Swindon (SEE PL17)
K7049 NWE PL10 Natland to Barrow-in-Furness on PL4 towers
K8323 1944–45 SWE PL16 XM1908 [Telecoms Work on Overhead Lines] inexplicably has XM1904-14 (BK47/9101) for type “D22”
K8790 1945 Preston Corporation ? ?
K9534 1946 PL16 D60 Junction, possibly more XM1991
K9857 1945–47 STL1 double circuit XM1955 As K8323 (SWE PL16) but with replacement line towers; designed to specification STL1
K9858 ? STL1 double circuit XM2014 Tummel–Garry customisations and additions
K9906 1947 Blaw Knox K9906 XM2049
K9989 ? L34 XM2015?
K1201 1947–50 STL1 single circuit (K1201 “Scottish”) XM2051
K1420 1947–1950s STL1 flat-formation single circuit (K1420) XM2054
K1641 1948–49 Northern Ireland 110 kV SC XM2095
K1124/K1124B 1940s, 50s, 60s PL16 XM2092 Seems to be a continuation of K8323/K9857; full date range unknown
K3931 1949 PL16? ? K3931-3 is extra material for DT90 E10, Carrington
K5128 1950–52 L66 (L66/89 or L1) XM2368
T250 ? Blaw Knox K1124 (PL16) DD2S double to single earthwire conversion
T1011 1951–62, 1971 L2 XM2534
T1073 1953 Rotated base gantries XM2683 Categorised under PL16 for now
T1120 1953–59, 1968 Blaw Knox L3 XM2758
T1498 1959–60 Inveraray–Taynuilt XM3506
T1521 1960 Blaw Knox T1521 XM3390 Enhanced L3 line tower for Scotland
T1648 1961 Blaw Knox T1648 XM3693 Enhanced L2 line tower for Scotland
T2175 1967–68 Blaw Knox T2175 XM4451 Enhanced L3 for Scotland
T2570 ? L3 “original metrication” XM5260 No drawings recovered and no indications as to the difference versus L3(c)
T2779 ? Milliken E177 tower customisation XM5604 Auxiliary crossarm to tower 131 at Bournville 33/11 kV substation, Weston-super-Mare
T866 ? L8 XM866
T472 1973–75, 1987 L4(m) XM472
MK1641 1974 Northern Ireland 110 kV SC (metricated) MXM2095
MT1120 1973–75 L3(c) MXM2758 “M” prefix added; drawing numbers do not appear to correspond to imperial L3
MT866 ? L8(c) MXM866
T2639 1975, 1977 Quoich-Broadford XM5379
T466 1978 L4(m) 66 XM466

J L Eve

Ordered by date of the primary contract for each tower suite, then grouped by follow-on contracts. Coverage for each drawing set is only complete inasmuch as details are available; even the drawing schedules for L123 (C534) appear to omit many of the items in the subordinate drawing sets.

Suite Drawing series Coverage Date range
Eve C15 0.1 C15/C23 1930
Eve C15 0.15
Eve C333 C333 1936 (drawn)
1948 (approved) †
Eve C670 (Eve 0.175) C432 Tummel–Garry (D2, …) 1946
C579 Beauly–Shin (D2 and DD2 only)
C670 Fort Augustus–Fort William (D10, D30, …) 1953
C711 Nairn–Keith 1956
C1099 Fort William–Lundavra 1965
S383 Unknown; S383-2 was copied from C670-16B ?
Eve C534 (Eve 0.4) C534 Original tower suite, Poplar–Brimsdown 1950
C565 …, GA and details, uplift crossarms D10 and D30, … ?
C580 Single circuit gantries (also C534, S79) ?
C697 …
GA and details, special D60 crossarms,
GA&ED, replacement long top crossarms for D60,
… 		?
C786 “Universal” crossunder tower
S79 Single circuit gantries (also C534, C580)
S82 …
D2 crossarms alterations for 30% increased vertical load (Felinfoel–Ammanford–Ystradgynlais);
Replacement DT and DT90 crossarms (Ystradgynlais), possibly the introduction of the Mk II DT;
DT modifications for Walsoken substation,
… 		1953
S121 Sealing end platforms for DT E30′, and additional stone guard for DT sealing end platform 1958
C811 …, D30 E20′ long crossarms both sides, … T(4) CEA L264 1959
S123 …
Through-type DT towers (normal and line types), including 30′ top crossarm extensions;
Sealing end platforms, and oil tanks for such, for DT towers, including DT 30′ through type;
… 		1958–59, 1964
S158 Sealing end platform decking and stone guards; sealing end platform decking for DT E30′ and E40′ ?
S259 DT through type tower, special “butterfly” wide end crossarms 1966
C1225 Stowmarket/Thetford/Diss (Rickinghall junction DT) 1967
S289 Stone guard and decking, DT 1985
S346 Sealing end platforms, DT E40′ 1973
Eve L3 C673 Unclear; includes Pyle substation, Wales; DT possibly omitted 1954–56
C793 D60 E24′ ?
C916 DT and River Lea crossing ?
C864 Beauly–Blackhillock–Kintore additions 1960
S175 Stourport–Ludlow ?
Eve C772 (Eve 0.125) C772 1957
Eve L6 C896 1962–65
Eve C1415 (Eve 0.125) C1415 Tower suite 1970
C1824 Metric towers 1975

† best guess due to poor legibility

Watsham’s

Watsham’s drawing numbers do not definitively show any kind of internal numbering ranges. So far, no types are known to have exceeded 100 drawings: the first two digits match for all known drawings within a tower series, but this is not guaranteed to be true.

Suite Year(s) Known drawing range
SEE SL2 1929 11xx
SEE SL3(b) 1930 13xx
SEE SL4 1934 22xx
SEE SL8 ? 27xx
SEE PL7 1938 28xx

Callender’s

Suite Year(s) Known drawing range
SEE PL1(b) 1929–30 H,14,0xx to H,14,2xx
SWE PL1 S2 1931 H,14,5xx

BICC

Suite Year(s) Known drawing range
L6 1961–63 5SP4914

GEC/Pirelli-General

Suite Year(s) Known drawing range
SEE PL1a 1929 60xx–62xx
MEE PL1 1930 M.10,1xx–M.10,2xx
1935 M.10,477