The change to deGlehn required modification to the inside frames attaching a bearing flat surface to the outside of the inside frame, it also required the bogie mounting frame to be shorten removing the swing link mounting hole, once modified locos never changed back. It seem likely that about 1914 no more were converted the swing links were repaired, only the rebuilt Armstrong’s got converted. About a third of the Bulldogs were rebuilt only 1 curved framed one 3336 none of the Dukes were ever rebuilt. All the Dukedogs kept the type of bogie of the donating Bulldog 24 seem to have received the bogie from the Bulldog others had different ones of the same type. 3265 received a replacement bogie after 1939 for one with no strengthening plates on the spring brackets. The Birds all started with same bogie rivet pattern but by the 1940s there were at least 6 versions.All DeGlehn bogies have a row of 8 or 10 rivets along the bottom in 3 groups 1-6-1 ,2-6-2,2-4-2,3-4-3. 3394 Albany had DeGlehn in 1910 probably 1 of 3 fitted in 1908.
It is quite easy to see if a loco is fitted with swing links as the bottom fixings always pultrude below the frames even if only the nuts on the deep framed bogies.
