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Contract numbers

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For line contracts, see the schemes 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 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. Items marked † may be incorrect due to source material condition.

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 ?
E112 1929–33 NWE PL1 LT530
E136 1929–31 NEE PL1 LT2880†
E142 1929–31 EE PL1 LT231†
E111 1930–32 NWE PL2 LT630
E141 1931–32 SWE PL1 LT3630
E164 1932 SS PL1 ?
E177 1932–3 Milliken E177 XM911
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 Drawings for only two tower types (D30 and DD30) recovered
K1857 1936–37 CE PL4 XM1317
K4611 1939 Blaw Knox K4611 XM1631 Continuation of K1373
K5297 1940 WGR single circuit XM1692 XM range almost certain, but unproven; used by SWE PL9
K5735 1940–41 Blaw Knox K5735 XM1742 Only DD2 to DD90 recovered
K5784 1940, 1967 War Time Grid XM1746 Only DDT90 (1940) and DDT90 auxiliary crossarms (1967) drawings recovered
K6235 ? “PL4” XM1772 Gloucester–Ebbw Vale
? XM1775 Carlisle–Distington
? XM1783 Ocker Hill–Nechells
? XM1809 “Bedford - Little 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 Blaw Knox K8790 ? ?
K9534 1946 PL16 D60 Junction, possibly more XM1991
K9857 1945–47 “Scottish” XM1955 As K8323 (SWE PL16) but with replacement line towers; designed to specification STL1
K9906 1947 Blaw Knox K9906 XM2049
K9989 ? L34 XM2015?
K1201 1947–50 Blaw Knox K1201 XM2051 “Scottish” single circuit
K1420 1947–1950s Blaw Knox 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
K5128 1950–52 L66 XM2368
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 Only the D key erection diagram/drawing schedule recovered
T1648 1961 Blaw Knox T1648 XM3693 Only the D GA&ED recovered
T2175 1967–68 Blaw Knox T2175 XM4451
T2570 ? L3 “original metrication” XM5260 No drawings recovered and no indications as to the difference versus L3(c)
T866 ? L8 XM866
T472 1973–75, 1987 L4(m) XM472
MK1641 1974 Northern Ireland 110 kV SC 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 1977 Quoich-Broadford? XM5379 Pending 100% confirmation; details from portion of D10°L key diagram

J L Eve

Suite Drawing series Date range
Eve C15 0.1 C15/C23 1930
Eve C15 0.15
Eve C333 C333 ?
Eve 0.175 C432 1946
C579 1946
C670 1953, 1970, 1973
L16 (Eve 0.4) C534 1950
Eve L3 (original) C673 1954–56, 1960 (terminal)
C916 —
Eve C772 (Eve 0.125) C772 1957
Eve L3 (Scottish) C864 1960 (line), 1955–56 (angle), 1960 (terminal)
Eve L6 C896 1962–65
Eve C1415 (Eve 0.125) C1415 1970
C1824 (metric) 1975

Watsham’s

Watsham’s drawing numbers do not appear to show any kind of internal numbering ranges. So far, no types are known to have exceed 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 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(a)&(b) 1931 H,14,5xx

BICC

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