This would be in favor of something aesthetic as well as friendly to the user, because it is currently frustrating to see how although there are train lines or plane routes, the units continue "traveling" on the side as if there were no infrastructure, And worst of all, when they "travel" through the infrastructure, they don't go fast but at the same speed, not even prosecuted by pathfinding.

If it is not possible to add a graphical animation, unless it is forced or given the ALTERNATIVE of traveling by train (and the unit moves faster) or normal road (moves at normal speed).