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Suz X

I would recommend that you address the problem in two stages.
As Sol has suggested, check out the wheels of the locos as they need to be clean and also check the pickups that sit behind the wheels where they should be making contact with the wheel rims - they can be become lose and or dirty.
Once you have the locos traveling OK on the normal track - then focus on the points

Points are always problematic especially with small trains - large trains should run more smoothly since in theory they have more pick ups which can be spaced further apart so that have only one set of pick up wheels on the point at any time (If the DMU is stalling it may be because it is only be picking up from one set of wheels which would be about the same distance apart as the smaller locos).
Here are a few suggestions that may help.
- Does the train stall irrespective of the direction of travel?
- Does the train stall irrespective of which way the points are set?
If the answer is yes to both then dirty wheels/pickups on the loco are the likely suspect
If your answer is no to either then the points are most likely culprit

If you are able to watch the locos at eye level as they pass over the points, first ensure that all wheels are touching the track when it stalls - see if you can identify if it is the same spot every time - without touching the loco gently push the black/brown plastic that is used to change the direction of the points such that you are trying to push the points further - i.e not change them. If the loco moves again then your problem is most likely dirt between the fixed track and the switching blade ( the track that moves).

Hopefully this all makes some sense and is of some assistance.

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