In the latter years of British Rail, train drivers were on a basic salary of around £12,000 per annum, supplemented by a set of enhancements for unsocial hours and overtime approximately £4000–£5000. Sunday had never formed part of the basic working week for train drivers in the UK, and was instead worked as overtime. Thus many drivers chose to work Sundays in order to make a better income. British Rail was run in all departments on an overtime culture to reduce overall wage bills resulting from having to employ extra staff to fill what would be uncovered vacancies. This approach had implications for fatigue and excessive hours, which partly contributed to the Clapham Junction rail crash in 1988.