07-28-2015, 07:22 AM
(07-27-2015, 10:35 PM)Canard Wrote: It could actually be drainage holes from the ballast for the tracks above. There will be a poured concrete edge to hold the ballast in place, so the water that seeps through when it rains has to go somewhere.
The culverts had no visible openings other than at the ends, so I don’t think they will be accepting water other than from the ends.
The only thing I can think of is that the math says that the three large culverts aren’t big enough, but the next size up would be excessively large and the two small culverts are the cheapest way of meeting the capacity specification. But I don’t actually know.