AeroLiner3000 is a design-driven proposal for the first Double-Deck Train for the existing British loading gauge, which is lower than on the continent. It is a solution to the capacity crisis on British rail tracks, currently tackled by high ticket prices and extremely low seat pitches. A 9m long full-scale demonstrator shown at Innotrans 2016 shows the high quality interior and illumination, which provides passengers with comfortable seating. Designers and engineers employed the latest train technology and also incorporated aerospace thinking into the train design. A train like a business jet, small, but with high quality spaces.