The NYC MTA issues "Subway Delay Verification" notes that can be given to bosses, clients, etc. (maybe suspicious spouses?)
"Delayed Train? Skeptical Boss? M.T.A. Will Give Passengers a Late Note" -- http://www.nytimes.com/2013/12/10/nyregion/delayed-train-skeptical-boss-mta-will-give-passengers-a-late-note.html?pagewanted=1&ref=todayspaper
"Passengers are asked to provide information like their subway line and the times and locations of their entries and exits. And then, maybe hours later, maybe days, the authority returns with its judgment — the transit equivalent of a doctor’s note, if a bit more bewildering.
"'There was a disruption in service, specifically signal trouble, sick customer, brakes in emergency and track circuit failure, which caused massive service delays, reroutes and/or trains to be discharged on the 1, 2, 3, 4, 5, 6, 7, A, B, C, D, F, J, L, M, N, Q and R lines,' one recent response read, in part. 'As a result, any one delay lasted up to 82 minutes.'"
"Though a version of the program has existed for decades, enlisted chiefly by municipal workers who were paid according to a punched clock, the authority said that requests had nearly tripled since the service first became available online in 2010. In October, when over 156 million subway trips were taken, according to preliminary agency data, the authority issued more than 8,200 responses to riders who asked for the documentation."
"Delayed Train? Skeptical Boss? M.T.A. Will Give Passengers a Late Note" -- http://www.nytimes.com/2013/12/10/nyregion/delayed-train-skeptical-boss-mta-will-give-passengers-a-late-note.html?pagewanted=1&ref=todayspaper
"Passengers are asked to provide information like their subway line and the times and locations of their entries and exits. And then, maybe hours later, maybe days, the authority returns with its judgment — the transit equivalent of a doctor’s note, if a bit more bewildering.
"'There was a disruption in service, specifically signal trouble, sick customer, brakes in emergency and track circuit failure, which caused massive service delays, reroutes and/or trains to be discharged on the 1, 2, 3, 4, 5, 6, 7, A, B, C, D, F, J, L, M, N, Q and R lines,' one recent response read, in part. 'As a result, any one delay lasted up to 82 minutes.'"
"Though a version of the program has existed for decades, enlisted chiefly by municipal workers who were paid according to a punched clock, the authority said that requests had nearly tripled since the service first became available online in 2010. In October, when over 156 million subway trips were taken, according to preliminary agency data, the authority issued more than 8,200 responses to riders who asked for the documentation."