I have been re-visiting "Little BoB which is a highly experimental theatre for mixed interdictions.

It is called Little BoB because the theatre is more in line with the 1940 BoB battles, on a reduced tile-map 148x95 instead of 640x320.
Mixed interdictions are an extension of train interdictions, with convoys on railway lines. Train convoys are as they were before, running on visible railway lines, but the make-up of the vehicles is set by a flag in the railway file. The same flag determines whether or not the track is visible, and the graphic used.
This allows sea and river convoys to run on invisible lines. Truck convoys run on road graphics.

These screenies are from a test of a new exe, to see how it handles the different convoy types, Some convoys are in columns and the data in external files sets the number of columns, and the distances of separation.
The mission was a train interdiction:

On the way we ran into a sea convoy, with a destroyer causing flak, so we sank it:





Then we hit a road convoy and destroyed some vehicles



You can see the staggered formation of this road convoy.

Finally, heading for the mission target we found a second train running in the opposite direction, and attacked them both:



The trains had different convoy make-ups, one was all oil tankers, but the target convoy had a mixture of different rail vehicles.

That was both a lot of fun, and importantly it was a successful test