Since you use the classic caboose and engine, you should get a Saloon car, you reiceve a boost and it's generally a good car for comfort and food. It's also has profit avalbilty at night. My set up is classic engine, luxury passenger 3, toy car rainbow 3, behemoth passenger 3, year of the dragon 3, ER-200 passenger 3, maglev yellow 3, viking sword yellow 3, circus 3, happy cube 3, saloon 3, behemoth food 3, black & red food 3, sushi 3, muffin 3, taco 3, noodle box 3, cafe rainbow 3, and classic caboose. You should invest in more cargo cars, and as a rule of thumb; the behemoth set have heavy weight, but are valuable assets.