Assertion: siding's rail | /r/HasProperty | the heaviest grade of rail
Facets:
Source sentences:
text: Weight mark "155 PS" on a jointed segment of 155 lb/yd (76.9 kg/m) "Pennsylvania Special" rail, the heaviest grade of rail ever mass-produced
text: By and large, the heavier the rails and the rest of the trackwork, the heavier and faster the trains these tracks can carry.