Proof load tests on the BT-12 bogie frame and bolster assembly (TM-STM-31)

Bogies for the APT have been developed through a series of designs commencing with the 'Swinging Arm' version used at the outset of APT-E test running and culminating in the prototype designs, BP-17, BT-11 and BT-12. It has been considered necessary by the APT Design and Stress Offices to proof...