The Southampton and Dorchester Railway , now a Tea Room The London and Southampton Railway promoters had lost the first battle for authorisation to make a line to Bristol, but the objective of opening up the country in the southwest and west of England remained prominent. In fact it was an independent promoter,
Charles Castleman, a solicitor of
Wimborne Minster, who assembled support in the South West, and on 2 February 1844 proposed to the LSWR that a line might be built from Southampton to
Dorchester: he was rebuffed by the LSWR, who were looking towards Exeter as their next objective. Castleman went ahead and developed his scheme, but relations between his supporters and the LSWR were extremely tense, and Castleman formed a
Southampton and Dorchester Railway, and negotiated with the Great Western Railway instead. The
Bristol & Exeter Railway, a broad gauge company allied to the GWR, reached Exeter on 1 May 1844, and the GWR was promoting the
Wilts, Somerset and Weymouth Railway which was to connect the GWR to
Weymouth. It seemed to the LSWR that on all sides they were losing territory in the west country that they considered rightfully theirs, and they hastily prepared plans for their own lines crossing from Bishopstoke to
Taunton. Much was made of the roundabout route of the Southampton and Dorchester line, and it was mockingly referred to as ''Castleman's corkscrew
or the water snake''. The
Five Kings (the commission headed by
Lord Dalhousie) published their decision, that most of the broad gauge lines should have preference, as well as the Southampton and Dorchester line which was to be built on the narrow gauge. Formal agreement was reached on 16 January 1845 between the LSWR, the GWR and the Southampton and Dorchester, agreeing exclusive areas of influence for future railway construction as between the parties. The Southampton and Dorchester line was authorised on 21 July 1845; there was to be an
interchange station at Dorchester to transfer to the broad-gauge WS&W line, which was to be required to lay mixed gauge to to give narrow gauge trains from Southampton access. To demonstrate impartiality the Southampton and Dorchester would be required to lay mixed gauge on its line for the same distance east of Dorchester, even though this did not lead to any source of traffic as there were no stations or goods sidings on the dual-gauge section. Interests in Southampton had also forced a clause in the
Southampton and Dorchester Railway Act 1845 (
8 & 9 Vict. c. xciii), requiring the S&DR to build a station at Blechynden Terrace, in central Southampton. This became the present day ; the Southampton and Dorchester was to terminate at the
original LSWR terminus in Southampton. The line opened on 1 June 1847 from a temporary station at Blechynden Terrace westwards, as the tunnel between there and the LSWR station at Southampton had suffered a partial collapse; that section was finally opened on the night of 5–6 August 1847, for a mail train. Powers were taken for the LSWR to amalgamate with the Southampton & Dorchester, and this took effect on 11 October 1848. The Southampton and Dorchester line ran from in a northerly sweep through and , bypassing
Bournemouth (which had not yet developed as an important town) and
Poole; the port of Poole was served by a
branch to Lower Hamworthy on the south side of
Holes Bay. It then continued via to a terminus at
Dorchester which was sited to facilitate a further extension in the direction of
Exeter. The link to the WS&W line required through trains calling at Dorchester to reverse in and out of Dorchester station.
Fawley branch Local interests proposed a light railway in 1898; it was to run from a junction with the main line at Totton to Stone Point. A pier there was planned, to make a short crossing to the Isle of Wight. The promoters approached the LSWR for financial assistance, and a line to Fawley was confirmed by a Light Railway Order on 10 November 1903. However nothing was done and the powers lapsed. The light railway proposal was revived in 1921 with the backing of the Agwi Petroleum Co, which planned to erect a small oil refinery at Fawley. The £120,000 equity capital was partly funded by the LSWR. After some changes, the Southern Railway obtained an order on 27 February 1923. The line was opened on 20 July 1925. The line closed to passenger services in 1966, but at present plans are being implemented to reopen the passenger operation.
Christchurch and Bournemouth The Southampton and Dorchester Railway opened its main line in 1847; it was routed via Ringwood, considered at the time to be more important than Bournemouth. As Bournemouth grew in importance, it was decided to build the
Ringwood, Christchurch and Bournemouth Railway. It opened in 1862 between Ringwood and
Christchurch. Patronage was disappointing, but the line opened on to Bournemouth in 1870. The Christchurch to Bournemouth section became part of the present-day main line, but the line from Ringwood to Christchurch closed in 1935.
Lymington The Lymington Railway Company opened a line from Brockenhurst on the Southampton and Dorchester Railway main line to what is now Lymington Town station in 1858. The line was worked by the LSWR, which abosorbed the smaller company in 1879. Lymington was important industrially at the time, and a ferry service to the Isle of Wight enhanced the business on the line. The jetty at Lymington was cramped and inconvenient for passenger transfer, and in 1884 a short extension, crossing Lymington River to a new Pier station, was opened. The line was electrified in 1967, and continues in use at the present day.
Swanage The town of
Swanage was bypassed by the Dorchester line, and local interests set about securing a branch line. After false starts this was achieved when the
Swanage Railway Act 1881 (
44 & 45 Vict. c. clix) got
royal assent in 1881 for a line from Worgret Junction, west of , to Swanage with an intermediate station at
Corfe Castle. Wareham station had been a simple wayside structure, and a new interchange station was built west of the level crossing for the purposes of the branch. The line opened on 20 May 1885, and the LSWR acquired the company from 25 June 1886. Passenger traffic ended in 1972. It was taken over by a preservation society and the line reopened as a heritage railway in 1995.
Portland The Isle of Portland is formed of a very high quality stone much used for the construction of buildings. In 1865 the Weymouth and Portland Railway opened its line from Weymouth GWR station to Portland; it was worked jointly by the LSWR and the GWR. The Easton and Church Hope Railway was incorporated soon afterwards to bring stone down to a new jetty, but the company failed to build its line. A modified route connecting to the Weymouth and Portland Railway was opened in 1900. The entire route Weymouth - Portland - Easton was worked jointly, and then later by the LSWR alone. The line later declined, closing to passengers in 1952 and completely in 1965. ==West to Salisbury and Exeter==