At Boston Lodge works on the Ffestiniog Railway (and the Dinas sub depot on the Welsh Highland) volunteers complete a timesheet and "clock in" - for both rostered footplate duties and for working in the works. This is for legal reasons - for insurance, fire evacuations, working time directives, etc., and by completing the footplate duties proforma you are confirming that you are in a fit state to undertake safety critical duties (not under the influence of alcohol, recreational drugs or certain medications, medically fit and adequately rested).
Your sign on and sign off times are recorded, together with a brief note of the work completed - roster turn or workshop activity, and a running total kept. In the case of footplate work there is a minimum of 10 days required, and when volunteers work on grant aided projects their labour has an agreed value as part of the partner funding.
The footplate timesheets are collated annually and records updated.
Nick