I bought my son a 10875 cargo train. The train is great for playing, but I have a problem with crossing the bridge. I saw that this is common problem with 10875 and 10874 LEGO Duplo trains, so I would like to ask if there is any solution to improve traction. I regularly clean the train and wagons, but it still happens that the axle slips from the wheel when I have to cross the bridge. Did this option of adding rubber to the wheels improve traction?
I've tried changing the batteries.
Edit to add:
I don't think it's the pinion on the motor. I checked and cleaned all the gears and there is no damage to anything. I just didn't know how to remove and disassemble the rear wheels in order to check the part between the axle and the wheels, but I saw in other posts that when it breaks, the wheels should be free to spin.
It seems to me that they designed the wheels to slip badly. I would try to somehow improve that part for better traction between the axle and the wheels.
The train starts to climb the bridge piece and you can see that it has power, but it happens that you hear a screeching sound, and then the train stops, at that moment the wheel does not slip between the rail and the wheel, but just between the axle and the wheel.
That piece is used for slipping and was installed probably for the safety of small kids and children, but it lacks traction to cross the bridge track. If it was completely fixed, it would probably damage the tracks if the train gets stuck somewhere.
I think it slips on this part of the picture. It is between the wheel and the drive axle.
We have two bridges in the set, so that's quite a problem.