15. The Department does not usually apply money values to environmental impacts and improvements resulting from transport schemes, with the exception of assessing applications for Rail Freight Grants . Here, it must be shown that freight will transfer from road to rail, thus bringing about environmental benefits. Benefit values are assigned to lorry kilometres according to the type of road from which the freight is expected to transfer. The Department expects the Link to reduce congestion on existing rail routes by increasing rail capacity and consider that this will make rail freight more attractive, particularly between Ashford and the Tunnel. The 1993 Union Railways Ltd report also estimated expected freight transfer, but the Department could not locate the detailed calculations. We have therefore not been able to verify this figure.