 It comprised a transverse trunnion box member at the front, from which six longitudinal tube members ran aftward and converged into one large main central tube at the rear; the six longitudinal members were braced vertically and horizontally by smaller-gauge tubes.The rear central tube member supported a large horizontal-plane turntable.A steerable front truck was installed just behind the trunnion box member, while the turntable surmounted a two-axle rear bogey.