Example: there are a series of scheduled trains from London (St Pancras) to Nottingham. One day maintenance works meant the line would partly close overnight and the last train would run very slow. Since tickets were already sold the company intended to get passengers to Nottingham by Taxi, reasoning that few would take this already slow train and so a coach hire or other arrangement weren't cost effective.
Unfortunately an unavoidable incident elsewhere meant instead of a half dozen sleepy passengers arriving at the blocked line and being allocated a few taxis, hundreds of us turned up on that last train. The employee paid to order taxis made a few calls and was told too bad, the company will just have to eat the cost of hundreds of taxi fares, call all the city's taxi firms.