This is a very interesting idea. Although I haven’t tried to make it yet, it may enlighten you.
Two armored trains, running along the parallel track: one belongs to the Soviet army and the other belongs to the German army. Similar to the “confrontation mode”, both sides need to rely on armored trains to advance towards each other, and both sides can set up roadblocks on the railway.
Winning condition: completely destroy the other party’s train or capture the other party’s train, or consume all the enemy’s manpower