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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
E112 1929–33 NWE PL1 LT530
E136 1929–31 NEE PL1 LT2880†
E142 1929–31 EE PL1 LT231†
E141 1931–32 SWE PL1 LT3630
E177 1932–3 Milliken E177 XM911
K1611 1936–37 CE PL3 ? Only two drawings (D30 and DD30) recovered
K1857 1936–37 CE PL4 XM1317
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
K8323 1944–45 SWE PL16 XM1908 [Telecoms Work on Overhead Lines] inexplicably has XM1904-14 (BK47/9101) for type “D22”
K9857 1945–47 Scottish XM1955 As SWE PL16 but with replacement line towers
K9906 1947 Blaw Knox K9906 XM2049
K1201 1947–50 Scottish single circuit XM2051
K1420 1947–1950s Blaw Knox K1420 XM2054
K1124/K1124B 1940s, 50s, 60s PL16 XM2092 Seems to be a continuation of K8323/K9857; full date range unknown
T1011 1951–1962, 1971 L2 XM2534
T1120 1953–1959, 1968 Blaw Knox L3 XM2758
1973–75 L3(c)
T1648 1961 Blaw Knox T1648 XM3693 Only the D GA&ED recovered
T2175 1967–68 Blaw Knox T2175 XM4451
T472 1973–1975, 1987 L4(m) XM472

J L Eve

Watshams

Watshams drawing numbers do not appear to show any kind of internal numbering ranges.

Suite Year(s) Known drawing range
PL7 1938 2837–2878

Callender’s