Personally, I think using a variation of the Class 220 Voyager would be a better choice than a Class 221. They would also be more ideal in regional services out of Chicago. I picked the 220 over the 221 as the 220 is the only diesel-electric DEMU in the UK. It also uses a Cummings QSK19, which can be found on National Railway Equipment's (NRE) multi-engine GenSet switchers. Keep in mind that even though the these DEMU's are capable of traveling at 125mph (200kph), the tracks between Chicago and Seattle are not designed to handle those speeds. Because I believe that they should be used for regional service out of Chicago, I think that there should have three different variations, each with the same amenities, combined as a 4-unit, 6-unit, and 8-unit sets. These sets will actually be two separate consists coupled back-to-back, like the first-generation Eurostar high speed trains. On a 4-unit train, the first car is a Business Class car, the second a Coach Class car, the third a café car, and the fourth half-Business Class, half-Coach Class. The 6-unit train has the first car is Business Class, the second is half-Business/half-Coach Class, the third is Coach Class, the fourth is a café car, the fifth is Coach Class, and the sixth is Business Class. The 8-unit train has the first car Business Class, the second car is Business Class, the third is half-Business/half-Coach Class, the fourth is Coach Class, the fifth café car, the sixth and seventh are Coach Class, and the eighth is Business Class. Because the trains are made up of two consists coupled back-to-back, they can therefore be split in half and combined with each other if need be, such as during the morning and evening rush hour, the need for more or less of one class, etc. Because the 6-car train is in fact two 3-car trains, you can also have 5 and 7-car trains, increasing flexibility even more. Business Class has more legroom and has 2+1 seating, one seat on one side of the center aisle, two seats on the other side; Coach Class has less legroom and has 2+2 seating, two seats on each side of the aisle, and is cheaper than Business Class. Café cars provide quick, easy-to-fix meals, fixed by on-board staff, and a variety of drinks, plus 4-seat and 2-seat booths. All cars are equipped with Wi-Fi, and both classes are equipped with trays that fold down from the back of the seats.
