This is a builders photo of a Hunslet diesel from the 1930s, used on the 18" gauge railway at Woolwich Arsenal. The bogies look like two small diesel chassis. The loco is a B-B, not a C-C, the end cranks are on a layshaft and are part of the drive mechanism, not a third axle.-steves-:119806 wrote: Not sure what you been by the "2 mechs" part, could you explain it for me.
Using two 0-4-0 mechanisms and some weights with a single body gives you a large diesel with more power for longer trains, or for hauling dead steam locos back home.
Railcars of the pre-war period often had coupled wheels on the power bogie, like this Tasmanian one, built from Drewry parts in the 1920s.
It isn't a very clear photo, but it is basically just a bogie coach with a small 0-4-0 diesel chassis replacing the front bogie and a driving cab at each end.
Regards,
Graeme