its quiet easy to damage the road bridge section with blast damage from above or below due to its rather lightweight structure - the rail bridge section is much harder to take out as its stressed to withstand lots of weight so its massively reinforced with steel. It would need a direct hit with a large bomb from above or some rocket from the side. Both may be not feasible.
The real damage will be done by taking out a support strut/bridge pillar as that will be much harder to replace but that may be just impossible.
The real damage will be done by taking out a support strut/bridge pillar as that will be much harder to replace but that may be just impossible.