 One of the trains overran the home signal which was at danger.In 1949 a rear-end collision took place at Glasgow Cross; a passenger train driven by an experienced driver ran through several stop signals standing at danger; low standards of attention to signalling equipment maintenance were exposed, and it was clear that drivers were used to running through the line without being able to see many of the signals.In 1951 a rear-end collision took place at Stobcross; a signalman worked the block instruments irregularly, and there were two wrong-side defects in the lock and block system that enabled this.