In the city, the initial threat to the tram came from its perceived inflexibility and susceptibility to the growing traffic congestion in the city streets.
The second problem was the timetable system's inflexibility; trains could not be added, delayed, or rescheduled without publishing and distributing a new timetable.
In psychiatry and clinical psychology, it is characterized by adaptive inflexibility, vicious cycles of maladaptive behavior, and emotional instability under stress.