So I have found, after some info form a couple of members, that a thru train will bypass such points, if there is an indicator for such a stop further "up the track". But that led me to experiment with some resolve.
eg. A thru B to C stop.
Engines usually will deplete its water before the oil.
Let us indicate, that due to the mountainous terrain after "C", we would like all maintenance. However, any previous maintenance stops will be bypasses.
SO, at point B, only indicate "water", which will only stop at that water/sand location. Such can be done at other "thru" locations, until the train stop at point "C".
I bring this as a suggest, as in one scenaio, I was losing to "crashes", and frequent "breakdowns", because they were getting inadequate service along the way. Naturally, another alternative is to get complete service at each thru maintenance location, but that isn't reality, and a waste of revenue in time.
Hope this helps when such a problem occurs during other member scenario playing.
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