To ask the Scottish Executive whether the option of reopening the Airdrie to Bathgate route as a light rail line has been investigated and, if so, what the results of the investigation were and, if no such investigation has been undertaken, what the reasons are for its position on the matter, given that Scottish Transport Appraisal Guidance requires relevant alternative solutions to be developed for all schemes. Transport solutions in Scotland are assessed in accordance with the Scottish Transport Appraisal Guidance (STAG).