FS#6418 - bitmask_vehicle_info is not specified for all the engines
In https://dev.openttdcoop.org/projects/xussrset/repository/revisions/0692478a203e I've made a code for VL15 that should specify a flag for the 2-nd VL15 in a train in case it has specific refit.
When the train length is 2 sections or there are only wagons after the second VL15, the flag works correctly. But when I add the 3-d VL15 the flag disappears.
It looks like bitmask_vehicle_info is calculated only for the last VL15, but not the others.
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