Assertion: locomotive's engine | /r/HasProperty | required
Facets:
Source sentences:
text: On 20 April 1829 the board of the Liverpool and Manchester Railway project passed a resolution for a competition to be held to prove their railway could be reliably operated by steam locomotives, there being advice from eminent engineers of the age that stationary engines would be required.
text: This series of engines were normally used on the interstate runs, where multiple engines were required so back-to-back formations overcame the single-end handicaps.