Castle bogie modification
At Lego shows in 2024, my Castle class would occasionally derail when there was a kink in the track, particularly when entering corners.
I put this down to the chassis setup I'd chosen, based on Carl Greatrix's previous Castle model, whereby the rear bogie wheels were fixed to the main chassis. In some cases, it seemed these wheels were getting raised off the track by the driving wheels behind.
I've now re-worked the chassis to have a more conventional pivoted bogie. There is still only 1 set of flanged drivers, to allow the bogie to not crash sideways into the cylinders. However now the bogie is on a single pivot, positioned above the rear bogie wheels.
This should help to 'steer' the loco into corners, and the little shoulder on the pin piece also helps to keep the weight on the bogie wheels.
Castle bogie modification
At Lego shows in 2024, my Castle class would occasionally derail when there was a kink in the track, particularly when entering corners.
I put this down to the chassis setup I'd chosen, based on Carl Greatrix's previous Castle model, whereby the rear bogie wheels were fixed to the main chassis. In some cases, it seemed these wheels were getting raised off the track by the driving wheels behind.
I've now re-worked the chassis to have a more conventional pivoted bogie. There is still only 1 set of flanged drivers, to allow the bogie to not crash sideways into the cylinders. However now the bogie is on a single pivot, positioned above the rear bogie wheels.
This should help to 'steer' the loco into corners, and the little shoulder on the pin piece also helps to keep the weight on the bogie wheels.