Five years ago, when they were building the BART extension to the San Francisco Airport, an enviroweasel discovered a squished salamander on the construction site. A judge promptly halted activity for months, then allowed it to continue as long as trucks were speed-limited to ten MPH on the site. Speed was radar enforced. Net result: project ran over a year late and almost 100% over budget.
Meanwhile, a few yards away, Caltrain ripped along at 79 mph, as did the Southern Pacific before it for more than a century...
...oh, and did I mention that cold-blooded reptiles like salamanders like to rest on steel rails, since it helps them regulate their body heat?