Sentence:  <WSD>"Obtuse</WSD> angles of the through crossing." — The system of the two <WSD>obtuse</WSD>-angled points is especially termed the dead-crossing. ... The point itself, less liable to damage than that of the crossing proper, on account of its <WSD>obtuse</WSD> form and its position relatively to the wheels, acts the same part towards the tapered portion of the cut rail, as the wing-rail does with respect to the acute-angle of the crossing. 
Meaning of the word marked with <WSD> tags:  Larger than one, and smaller than two right angles, or more than 90° and less than 180°.