Man! You and the other guy solved my problem!!!! Big thank you, i can go on with my save with latest patch!!!!
Solution for this problem (thx to the post above mine and to jamiech1 which posted temp solution at the link provided above):
In the water_rails.lua file in the prototypes folder (cargo ship mod) change the collision mask as shown here:
--bridge_crossing.collision_mask ={}
bridge_crossing.collision_mask ={"object-layer"}
and
--invisible_rail.collision_mask ={}
invisible_rail.collision_mask ={"object-layer"}
Thank you guy, i love this community.