While glancing through
Nicholas & Alexandra: The Last Imperial Family of Tsarist Russia, I found a photo of one of the carriages in the train. I'm not sure which one it is, though:

The book gives this information about the train itself: "After the derailment of the imperial train on 17 October 1888, a new train was needed that met the requirements of contemporary railway technology. There were ten carriages, of which seven provided living quarters for the imperial family: four private cars, a dining-car, a carriage for the children and a sleeping-car for the grand duchesses. Of the remaining three cars, one contained the imperial kitchen, and two were occupied by luggage and servants. The carriages were designed to provide maximum comfort and space for the passengers. The decoration was highly luxurious, but harmonious, making much use of mahogany, walnut, beech, maple, leather, velvet, silk, and ormolu."
This passage also brings me to a question about the train. Because the derailment happened in 1888 and Nicholas' train wasn't built until 1896-97, why did it take 10 years before another imperial train was built?