Report on APT suspension feasibility study - phase 1. (Job no. 4027) (IM-SUS-021)

It had become evident by December 1968 that the proposed asymmetric suspension scheme incorporating a cannon box (IMAPT/270) was inadequate for the high speeds required of the APT. The main cause for concern was the tendency for excessive "wheel hop" at rail joints (JMAPT/340), which could lead to an unacceptable...