A series Landy, Jethro? Which series? the spartan "1" the in betweener "2" or god forbid the axle snapping "3"?
I think the series relate to the level of Meccano you are capable of. However, at least on a serious series you could remove the gearbox and transfer case a and carry the components to the workbench unlike the Rangie. Now the Rangie is a serious Meccano set requiring multi skill levels to be proficient to work on. Crane driver/tow truck driver, Auto electrician, DIY electrician and of course, Lucas trained??? electrician. Nuts and bolts expert, and also with serious training in electromagnetic manipulation to pick up all the bits and pieces as they dropped of while on a journey. The earlier versions could at least have basic maintenance performed with a hammer, shifter and screwdriver/chisel.