The Box Cars are a pair of green vehicles with sliding doors which revealed some cargo boxes. One car is yellow, and the other is blue.
- Barnes and Noble Box Car (2000?-2003?)
- Yellow and Green Box Car from the Conductor's Figure 8 Set (2002-2009)
- Zoo Box Car from the Zoo Cars (2002-2012)
- Chapters Indigo Box Car from the Stories of Sodor Set (2002?-2005?)
- Mr. Jolly's Chocolate Factory Box Car (2003-2004)
- Birthday Box Car with the "Happy Birthday" Thomas (2006-2010)
- Sodor Milk Van from the Sodor Dairy Cars (2007-2012)
- Chicken Box Car from the Sodor Chicken Cars (2008-2010)
- Chocolate Bunny Box Car from Percy and the Chocolate Bunny Car (2010)
- Musical Candy Cane Car from Thomas and the Candy Cane Car (2011-2012)
- Cow Car from Toby and Bash on the Farm (2011-2012)
- Country Show Box Car from Thomas' Country Show Delivery (2011-2012)
- Disguised Den from Diesels in Disguise (2016-2017)
- The Box Cars are mostly comprised of plastic.
- When the doors are opened, you can see cargo inside and, in more recent variants, have sound played.
- For a short time in the early 2000s, a boxcar was packaged with Culdee.
- Some retail stores gave out a free unpainted wooden boxcar with the purchase of 2 engines.