The new Cummins engine and Allison transmission package on the J4500s meet 2010 EPA standards that mandate near-zero NOx and particulate-matter emissions. It's a feature that appeals especially to Royal Star, which caters to an eco-conscious clientele.

The coaches also offer top-level amenities to passengers the moment they ascend the spiral stairway and take in the crisp LED lighting. Roomy Amaya Brasil custom upholstery seats with self-retracting footrests and fold-down armrests offer comfort, while a Bosch entertainment system pampers passengers with six 15-inch video monitors and concert-hall sound. Hostess tables allow tour leaders to more conveniently serve passengers.

Safety and performance features include automatic traction control, six-channel antilock braking, electronic steering control, a tire-monitoring system, a kneeling system and wide-ride suspension with Koni shocks, all of which come standard on the coach. Royal Star additionally opted for an electronically controlled air-suspension (ECAS) system and ASA backup camera.

The coaches also feature digital destination signs, aluminum wheel hubs, conversion-style front cornering lights, and custom paint and graphics.