This from a post on uk.railway - Doesn't say what scale though!
Applications are invited from analysts with some experience of transport modelling for an exciting role in The Department for Transport Rail Group. Using your analytical and modelling skills you will work at the heart of rail policy; with a key objective to influence that policy. You will help to run, maintain and develop a full range of analytical models that assess how people use the rail network, covering areas such as crowding, capacity, performance, safety, cost and in particular passenger demand. Ideally, you'll have experience of rail demand forecasting and modelling with strong IT skills. Knowledge of EMME/2 and the PDFH would also be useful but not essential.
Salary range: £34,328 - £41,358. Based in London.
Further details available on the DfT website