Union Pacific Railroad's causeway across the Great Salt Lake acts as a dam that isolates the northern arm of the lake from the southern. As a result, the northern arm is saltier, and this has broad impacts not only on the lake's ecology but its extraction industries. It would not be unreasonable, then, for government to require the railroad to monitor the effects of the causeway on salt concentrations in the lake.
That said, the railroad is not the only industry with a duck on this pond. If a monitoring system is a good idea, then other commercial interests on the lake should help pay for it as well. Brine shrimpers and the magnesium and sulphate of potash industries would be logical candidates to contribute.
The monitoring issue has risen because the causeway has settled, up to 20 feet in some places. To deal with that emergency, the railroad has asked permission of the U.S. Army Corps of Engineers to plug two culverts and build a new bridge. The culverts allow water to circulate between the two arms of the lake, but one is cracked and in danger of failing. The corps has approved emergency repairs but also has required the railroad to develop plans to monitor the impact of the improvements and ensure that salt circulates freely between the two arms of the lake. The railroad is objecting to these conditions.