Here's the thing though, a over/underpass would have a greater long term economic impact to the city than the cost of the infrastructure. The train crosses a lot more and for a greater amount of time than most people realize, especially on a Friday and Saturday night, impacting hundreds (likely thousands) of people a day. They either sit and wait burning gas or go around it on the Interstate/Columbia Road overpass. Taking both time and money out of the citizens of Grand Forks everyday. The amount of money that could be in the pockets of citizens and instead went to gas in the last decade is likely in the millions.
And it'll only get worse as more student orientated housing is built on 42nd.