Locomotive engine construction in Great Britain is conditioned by certain limitations of size imposed by the height of bridges, tunnels and so forth on our old railway lines. But British engineers have responded to the challenge by using all their ingenuity to get the utmost power with the limited dimensions allowed them, and in this held their results are unrivalled. The longest non-stop runs in the world, for instance, are made in this country. Mr. Cecil J. Allen, who is a well-known writer on railway matters, and a regular contributor for many years to The Railway Magazine, will describe the year's developments in the railway world, and in particular the competition in locomotive design amongst the four great lines.