It's well-known that Hilter was very cozy with the major German industrialists - the relationship between Hitler and I.G. Farben chemical was particularly disturbing. He didn't have such a good relationship with the military - a large number of high-ranking officers were involved in the 1944 assassination attempt.
I gather that in general, railroad lines are not good targets for bombing. Bridges are, trains are, but not the tracks themselves. When tracks are damaged here at Donner Pass on the Transcontinental Railroad, they can be fixed within hours. And Hitler had slave labor to do the repairs.
Frank mentions the Resistance. I suppose it wasn't pacifist, but its most effective targets were facilities instead of people - and certainly not civilian targets. The Resistance was certainly effictive against railroads, apparantly much more effective than aerial bombing.