From: east coast, usa
A little info/advice: Putting one Bautrupp on a rail line will have limited results. You'll get better results stacking a few in important areas. If you are running a one-thrust offensive at one particular area, stack them all there, no sense in spreading them out. Remember, they work on percentages so some turns you will be angry at how few get repaired [zero at times], other turns you will get a bunch fixed.
Also, you don't have to keep the trupps right up in the front lines. Its their proximity that gets the job done, so a few hexes back and out of harms way is good enough.
And, remember to use the '.' [dot, period] key at the beginning of each turn. This will phase thru embarked units. When a trupp is selected, move it if you like then hit the dot key again to go to the next one. If you don't want to move a selected one, just hit the dot again and it will disembark and then go to the next one. Makes no difference if the trupps are embarked or disembarked.