If the route is a regular one, perhaps the main exfil route for casualties as well as infil for supplies and new troops, maybe you could add the equivalent of stage stations enroute? This could be a requisitioned farmyard alongside the tracks where the ambulance wagons stop for the night. Place it at the end of whatever distance you decide your wagons can cover in a day, or just before/after harder terrain where the horses have had to cope with any inclines. Horses or oxen could be swapped out for fresh teams, food given to patients and crew, wounds checked etc. It might be manned by a half dozen rear area staff or just a few locals. It may serve as the nearest thing to a military outpost in the area, or it may also be a comms hub, with either telegraph cables, phone lines or the Soviet equivalent of the Pony Express passing through. Either the players can take this over and catch the wagon(s) as they arrive or they have to hit the wagon midway between two stations to avoid the guards from each responding.
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