I focused on the 40ft version and initially bought everything that came out............ until I hit 60 different ones and my billboard reefer train was complete. Most I have run at one time actually is about 45 of them.
Link: https://youtu.be/O1XQv2d96EU
This train has about 20 or so and looks like a bigger train that it is. The 12' x 14 ACCR has a limit of about 35 cars with engine typically............... beautiful cars for steam era freight trains.
Mark