The MGWR Class D-bogie were first 4-4-0 operated by the Midland Great Western Railway (MGWR) of Ireland. They were rebuilt from MGWR Class D 2-4-0 locomotives in 1900/01 with the intention to use them on the Dublin to Sligo mainline but they proved underpowered for this work and were allocated to more suitable work around County Mayo, including Achill. This led to their nicknames of Mayo Bogies or Achill Bogies. Following the merger of the MGWR into Great Southern Railways (GSR) they also became designated class 530 or D16.
Locomotives
{|class="wikitable"
|-
!MGWR No.
!Name
!Introduced
!D-bogie
!GSR No.
!Withdrawn
|-
|2||Jupiter||1880||1900||534||1949
|-
|3||Juno||1880||1901||535||1949
|-
|25→4||Cyclops||1880||1901||531||1945
|-
|26→5||Britania||1880||1900||532||1949
|-
|36→1||Empress of Austria|||1881||1900||530||1949
|-
|37→35→6||Wolfdog||1881||1900||533||1953
|-
|}
Design and historical development
The 39 MGWR Class D locomotives were originally built as 2-4-0s between 1873 and 1887 by five different manufactures. A batch of six in 1880/81 were built by Beyer, Peacock & Company, Manchester and these were destined to be rebuilt as 4-4-0s.