There is shouldn't be the ROW is almot all a flat desert with the space already there. a few dozen small bridges are needed ether as part of overpasses or for rivers. They've only got 16 grade crossings from Colton to the Cochella yard.I think there's probably some assumption of significant work grading, etc. It might not involve massive construction works, but even redoing a grade crossing here or doing some filling in on the sides there could probably add quite a bit to the bill. [Also, that indicates 50% relay, and wouldn't this involve 100% being laid?]
the top number was all new and I used the 300$ a ft which is more than what new rail on concrete ties with PTC would cost. CTC cost is mostly down to how many crossovers you have