Your search for "cargo" revealed the following
Lexi and Tender with Cargo Car (2013) Good Condition Used - Trackmaster Revolution
Thomas brand used Battery Lexi 2013 Mattel
$39.97 CAD
Percy - Fizz ‘n Go Percy with Cargo Car & Cat Used - MINIS
Used Mini as shown. Please note minis are individual trains and are not compatible with wooden or Trackmaster track
$12.00 CAD
Talking Percy and Cargo (2009) #1 Noisy Different Clip Used - Trackmaster
Thomas brand used talking Percy and Cargo for the Trackmaster railway. 2009 Mattel
$32.50 CAD
Philip and Cargo Car (2013 Mattel) Good Condition Used - Trackmaster Revolution
Thomas brand used battery Philip for the Trackmaster railway
$29.97 CAD
Cargo Car - Thomas - Fizz ‘n Go Cargo Car with Alien Used - MINIS
Used MINIS as shown. MINIS are small, approximately 2" collectible trains. They are individual items and are not designed to be used with other train sets, tracks, or other brands.
$9.00 CAD
McColl's Farm Adventures Cargo Car Green Wheels All Engines Go Used - Motorized
car for Trackmaster
$4.97 CAD
Coffee Bean Truck with Cargo Pull Along Capsule Plarail - Used
Capsule Plarail trains are approximately 2" long and 1" high. They are much smaller than standard Thomas & Friends trains and are not the same scale as TOMY, Wooden, Trackmaster or other railway systems. Small parts recommended for 3+ years old
$9.97 CAD
Cassia Crane & Cargo Set with Trains Used - Trackmaster Revolution
Thomas brand Newer Style Trackmaster Set
$47.50 CAD