Contractors

Oldham family
Came from Warwickshire farming stock: Brian Lewis. The Oldham family of railway contractors (J. Rly Canal Hist. Soc. 2015, 38, 235) includes a family tree with Henry Oldham at its head.
Oldham, Elisha [Wright]
Came from Warwickshire: born in 1792 and died in 1879. Brian Lewis. The Oldham family of railway contractors (J. Rly Canal Hist. Soc. 2015, 38, 235) records that Elisha Wright Oldham held Patent: GB 8837/1841 Construction of turn-tables to be used on railways. 8 February 1841 (Woodcroft gives date shown; Lewis who reproduces diagrams from Patent quotes 5 August 1841, presumably publication date, but Woodcroft does not include "Wright").
Oldham, Henry
Brian Lewis. The Oldham family of railway contractors (J. Rly Canal Hist. Soc. 2015, 38, 235) records that was Thmas's eldest son and was involved in disputes with Brunel over a contract near Bathampton on the main line and subsequently with the OWWR where Brunel was called in to arbitrate.  
Oldham, John Bingham
Brian Lewis. The Oldham family of railway contractors (J. Rly Canal Hist. Soc. 2015, 38, 235) records that was Elisha Wright Oldham's youngest son and worked with him on the E&WJR and GNR contracts. He spent a short time in Worcester Gaol for debt in 1866/7 and died in Camberwell in 1899.
Oldham, Thomas William{s)
Born in 1790; died in 1866, Brian Lewis. The Oldham family of railway contractors (J. Rly Canal Hist. Soc. 2015, 38, 235)

Ranger, William
Born in 1800; died 12 September 1863.Established builder of docks and other major buildings who was relieved of his work (mainly of tunnels) between Bristol and Bath of the Great Western Railway mainly because his work was too slow. This resulted in litigation which was not resolved until 1855. Chrimes in Skempton; Macdermot