On my version the powered flangeless center wheels never touched the rails so all traction is from the geared outer wheels. So essentially only 2 out of 6 axles are powered. I switched the flanged wheels to the geared center axle and added new flanged wheels to the inner axles. Initially I experienced derailments even in R3 curves so I cut away some of the insulation in the wheel centers to give the inner axles some side play. Works well on R3. I guess all traction is on the two geared axles per truck and the inner axles are carried along by the side rods without much force being transferred.Has anyone tried adding a flanged drive wheel instead of the blank wheel on the LGB Crocodile locos? Will the plastic drive side rods handle the added stress? Just wanting to make a more realistic loco. Other locomotives have longer wheel bases with all flanged drive wheels as steam locos.