|Derwenlas shown within Powys|
|OS grid reference|
|Sovereign state||United Kingdom|
|Fire||Mid and West Wales|
The narrow-gauge Corris, Machynlleth and River Dovey Tramroad (opened 1859) carried slate from the quarries around Corris and Aberllefenni to the riverside quays here, including Cei Ellis and Cei Tafarn Isa, where it was loaded into ships for onward shipment.
At around the time the tramway became the Corris Railway in the early 1860s the Aberystwyth and Welsh Coast Railway extended the standard gauge rails west of Machynlleth and on reaching Derwenlas, built the new line across the bend of the river by filling in the channel and creating a new course for the Dyfi, in the process cutting off Derwenlas' quays from the river channel and killing off the port.
The Tramroad had originally continued to Cei Ward at Morben, further downriver, but the entire section west of Machynlleth was abandoned and slate was instead trans-shipped to main line trains.
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