Coast Line Models' main purpose is to expand the range of models available in 4mm to cover the Cambrian Railways, which is where the 'Coast Line' brand comes from. Naturally with all things pre grouping you cannot just concentrate on stock from one company, so amongst the Cambrian items are such far flung things as Great Eastern and Furness wagons.
Secondary, but still important, is the Narrow Gauge section. This concentrates on the finescale end of the spectrum, offering 4mm scale narrow gauge that is most definitely not for the rabbit warren approach. In this section, 2mm Finescale track and wheel standards are adopted unless specified otherwise.
There is now also a section for 16mm scale Quarry Hunslet parts, designed to bring the Slater's kit right up to code.