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To some extent the answer depends on the era you are modelling. If it is 1960 or before underground is more likely since the installation is much less expensive and the possibility of damage from a derailment is far less. After the mid 1970s above ground would be the preferred installation because the equiment needed to prove that the underground piping was not leaking was more expensive than just installing it overhead. This was brought on by regulation from the Federal EPA and from the corrisponding state agencies Other considerations are how cooperative is the railroad and how busy the mainline? If the railroad is cooperative and the mainline not too busy an underground installation can be done. If the railroad refuses to permit underground crossings or the line is too busy to shut down for the time necessary to install the culvert then overhead is the only option. Where I work we installed a waste water pipe under a railroad secondary line. It tooks years (yes years!!) for the legal departments of our company and the railroad to come to an agreement. And then the railroad gave us a 12 hour window to install the pipe. We did not dig up any of the roadbed. But we needed access across the top of the tracks for the equipment used to shove the pipe through the soil. So as a final answer both overhead and underground are prototypical, and there are good reasons for either installation.
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