Assertion: elevator's system | /r/CapableOf | pull against rail
Facets:
value: to prevent imperfections
type: PURPOSE
value: to prevent any misalignments
type: PURPOSE
Source sentences:
text: The rollers used at 1 WTC are made of polyurethane so they can absorb slight imperfections in the rail joints and are controlled by a system that pushes and pulls against the rails to prevent any misalignments or imperfections from interfering with a smooth ride, according to Alpharetta, Ga.,–based ThyssenKrupp Elevator, which holds an $87.98-million contract from The Port Authority of New York & New Jersey for elevator and escalator service at 1 WTC.