A book for railway-enthusiasts that provides directions to some 125+ depots, quarries, sidings, terminals and yards within England, Scotland and Wales, where diesel and electric locomotives are to be found. The guide is essentially the 2nd Edition of the original directory produced in 2013, adding a further 25 sites, plus a look at the key preserved railways where locomotives are to be found. For each location one or more recent photographs are shown providing an indication as to the view you are likely to see when visiting the sites. Both public transport and car based directions are provided to get you there; supplemented by a detailed map. These bespoke maps, in addition to providing guidance on how to reach the sites, also highlight the locations providing the best views of the sites. i.e. this is not just a guide to the depot entrance; but more of a guide to good site viewing points, the former only being mentioned where this provides a good view. Each depot is clearly rated, based upon a five star criteria which considers both the number and variety of locomotives that you are likely to see, along with more environmental factors such as accessibility, facilities and day/time of year considerations. The authors' personal favourites are also identified. Finally, the guide includes bespoke rail 'rover' and 'ranger' maps and tables identifying which sites each ticket allows you to visit and/or travel past by train.