Looks to be more than 200' (those cars are about 57.5', if not longer) attached to a bridge, most of which is over water, carrying a busy freight line. Engineering and work plans will have to be submitted and reviewed. Contractor(s) with all the necessary training will have to be engaged, possibly through a competitive bidding process. Materials will need to be ordered and delivered. If the track needs to/can be taken out of service, and alternate service plan may need to be developed, and customers may need to be notified of potential service disruptions. If the track cannot be taken out of service, repairs will take longer and be more costly. I think we quote a cost of around $1,800/day/flagman. Probably need two for that job.