The industrial wood wagon is a logging wagon made by mbb. Its red colour matches the that of the Industrial Engine. There is no custom logic to change the model to have logs, but that would be a nice feature! There are other mods where you can have visual loads, such as Moretrains with the moretrains loaded wood wagon and DlxTrains with the European Stake Wagon

Mod name	advtrains_train_industrial
Author	mbb
Inventory image
Screenshot
Track type	default
Crafting recipe	No
Wagon span	1.8
Max speed	20 m/s (72 km/h)
Cargo inventory size	24
Passenger seats	No
Driver stand	No
Animated doors	No
Animated wheels	No
Motive power	No
Drops	default:steelblock 4
Horn sound	No
Motor sounds	No
Liveries	No
Line number display	No
Particles	No