If you mix and match the trains in different Yuoki mods you get weird behavior such as the future trains (red zephyr) can only move at 259km/h if it has the Special Cargo Wagon (maai) attached. This reduced speed limit depends on the type of cargo wagons. Can you make the speed limit of the wagons very high so that trains are limited by the engines capacity only? (vanilla wagons cap at 324, and the fastest 4A-Specials go to 432).
