No deck, sometimes no side sills and sometimes no end sills.

A number of velocity-reducing components can be incorporated into the their design to include chute blocks, baffle blocks, wing walls, surface boils or an end sill.

The main body of the vehicle is self-supporting, consisting of an underframe of three longitudinal sill plates (centre and sides), side walls, transverse support members for the bogie pivots and for the transformer, and end sill plates.