The only non-train period on this section of the WCML is Saturday night, therefore repair work at any other time inevitably causes disruption. This raises the question of whether, if one line is open for Single Line Working (SLW), should this remain in place until Saturday night, or should repairs be made now in order to restore normal working as soon as possible? In this particular case perhaps the decision was made to clear the landslip, but if this required a blockage of both lines and then took longer than anticipated, the altered arrangements for the sleeper services are understandable.