Two important bits.
Press TAB in flight to see (amongst other things) the bomb fuse settings. You'll see the drop altitude and the delay timer. Very useful in figuring things out.
Also the bomb fuse type is important. With the FAB-50 you have options of Instant (with a short delay as an option), Delay (with longer delays), and Low-Level which allows you to drop the bombs at very low altitudes.
You may want to employ the Low-Level option while attacking the train. Low level with a significant delay (but not too long as the train will have moved along.
You should be able to destroy box cars with the 4 machine guns but you may not be able to get the locomotive with guns alone. Not those anyways.
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