Level bombing in any plane that does not have a special level-bombing gunsight is very hard, even against a long target like a train or a column of vehicles. Try dive-bombing in a quickstart mission, it might be easier than you think.
The compromise is to approach and release at a shallow angle, less than 45 degrees, not quite dive-bombing but not level either. Do choose the low level option with the 5 second fuse, you're bombing a WWII train not a modern French TGV, it doesn't move fast enough to need much lead. Do some quickstart missions and start by releasing your bombs just when the target disappears under your nose, watch the replay and adjust as needed.
The hardest part when attacking a train should be not the required lead or timing, but rather aligning your plane with the length of the train. If you're off by a few degrees then an imperfect drop will miss the train, and a FAB-50 will be too small to cause damage. If your alignment is perfect, then you'll still hit even if your timing is a bit off.
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