This was a four way junction. The location was originally called Auldton Heights.
The original line here ran north through Brocketsbrae and Netherburn to Lesmahagow Junction. To the south it ran to Coalburn and Bankend.
There were collieries here, Auldton Heights Pit and, further west on a shot tramway, Auldton Pit. Auldtonheights Sawmill was to the east of the junction alongside the line.
In 1883 a connecting line was opened south to Poniel Junction giving access to Muirkirk [2nd]. To the south of the junction, on the west side of this new line, were sidings Alton Heights Junction Sidings. A box opened to control the junction and was replaced in 1891.
Around 1891/93 a workman's halt opened here. Alton Heights.
In 1905 the Mid Lanark Lines opened (the box extended in 1904 in preparation), giving a new access to the north via Lesmahagow [2nd], Stonehouse [Lanarkshire] and Larkhall Central to Ferniegair Junction. In preparation, the box was replaced in 1904. The sidings to the south were expanded on the west side of the line. All approach lines remained single track, however the junction itself was doubled, the approaches from Lesmahagow [2nd] and Coalburn doubling - this provided a loop on the route.
The halt closed in 1952. The route north to Netherburn closed in 1953 and the route south to Poniel Junction closed to passengers in 1939 and completely in 1955.
The box remained open as there was a passing loop here on the line south to Coalburn which still carried a passenger service and served the large Auchlochan Colliery. There was also the occasional Pigeon Special.
Coalburn closed to passengers in 1965 and the box closed. The line south was cut back to the colliery. It closed completely in 1968 with closure of the colliery.
The formation of the closed lines remains clear, although increasing overgrown. To the north is a substantial bridge over the original route north. This was built when the road was turned into a dual carriage way. It reverted to two lanes with the opening of the M74.
Nearby stations Alton Heights Brocketsbrae Auchlochan Halt Bellfield Platform Lesmahagow [2nd] Coalburn Happendon Ponfeigh Bankend Sandilands [Lanarkshire] Auchenheath Douglas West Blackwood [2nd] Blackwood [1st] Lanark | Auldtonheights Sawmill Auldtonheights Pit Alton Heights Junction Sidings Auldton Lime Works Auldton Pit Mines Brocketsbrae Shed Lintfield Bank Siding Auchlochan Nos 9 and 10 Collieries Auchlochan No 2 Colliery Bellfield Colliery Pit No 3 Bellfield Colliery Pit No 4 Auchlochan Nos 6 and 7 Collieries Tourist/other Auchren Level Crossing Auchlochan House |
Location names in dark blue are on the same original line. |