The "Cornwall" is a day coach 78 feet 6 1/2 inches in length over all, with a width of 10 feet 3 3/8 inches, an extreme height over rail of 14 feet, and a weight of over 59 tons. It is divided into a Reception Room, Boudoir, Dining Room, and Kitchen.

The Reception Room, the largest room of the suite, opens directly onto the observation platform at the rear of the train. The woodwork is of Circassian walnut, and is undecorated save for a few ornamental mouldings. The entire upper part of the room above the cornice is finished in quiet antique gold. The mouldings and ornaments are touched with gold and blue. The decorations of the room are in the style of Louis XV. The curtains are plain, of dark blue velvet, draped simply back from the windows, and the floors are carpeted with heavy Wilton of a quiet grey-green tone. The furniture, consisting of a large sofa, light roomy armchairs and table and desk, is upholstered in blue velvet to match the draperies, and a specially designed piano of Canadian manufacture is conspicuously placed in this room.

A short corridor, finished in mahogany, leads from the Reception to the Dining Room. Half-way in this corridor a door opens into the boudoir. This room is finished in pearl gray enamel. The walls are divided into panels framed with delicate modelled ornament in the style of Louis Quinze, and filled with paintings, soft yet rich in colour, after the manner of Watteau. Ornamental frames in the ceiling, filled with lattice work, provide ventilation. These, as well as the ornament around the wall panels, are touched with gold. The draperies are of light blue moire silk. A couple of small chairs, a divan, and a table finished in gold, the latter carrying a reading light, complete the furnishings of this room.

The woodwork in the Dining Room is of African Coromandel, the coves and ceiling being carried out in a lighter tone. The ceiling is plain, save for the gold frames of the electric fixtures. Ornamental cartouches in bas-relief display at one end the heraldic bearings of the King, at the other the combined coats-of-arms of the Duke and Duchess of Cornwall and York, while the arms of the Dominion and the private badge of the Duke face each other on opposite sides of the room. The hangings are of green velvet, the portieres and wall draperies being decorated with painted and embroidered applique in tones of gold and green. The furniture matches the other woodwork in the room, and is upholstered in velvet of a rich warm brown. A candelabrum-like electric fixture supplies light for the dining table, which is capable of extension to seat eight persons.

A corridor similar in finish to the one already mentioned leads forward past the pantry, kitchen, and storerooms, towards the night car.