Also in that time, public concern over crude oil trains has risen after a series of high profile derailments and explosions, with activist groups circulating frightening maps of all the homes, businesses, educational institutions, stadiums, etc. that lie within the line's one-mile "blast zone." The Port of Baltimore has set numerous records for the amount of cargo it has handled but remains inhibited by the Baltimore bottleneck, which does not allow for double stacked trains. Meanwhile, the one promised major upgrade to public transit in the area, the Red Line, was summarily killed by Gov. Larry Hogan, who cited as his major concern the cost of constructing a tunnel under downtown.