1984-1986, Lou Sullivan, personal diary, quoted in 2019, Ellis Martin, Zach Ozma (editors), We Both Laughed In Pleasure Know I cannot rely on him to do anything for me while recovering from my surgery. But Bridget & Maryellen are very willing to be on-call for me and even Jim/Kathleen are offering their place for me to come over.
He spent the weekend on call and couldn't fully relax.
The traditional way of dealing with these events was for an on-call traffic manager to review (with the engineering functions) the likely time normal working could be resumed.2019 November 20, “Industry Insider: East Coast problems”, in Rail, page 76: