Train Cars Disappear

[Smurfii]

In certain chunks, the train cars disappear. At first we thought it was from curved railroads, but we have some long straight rails where the train car disappears as well. In some chunks that we stand in, you can see that the train (even if in a different chunk), will turn invisible when you stand in certain chunks. This is not from render distance, say there's 4 cars, the second disapears but the third and forth are still visible.