Freight does better when it is slow and cheap per ton mile. They also tend to be long to save on labor costs. Passenger rail is pretty much the direct opposite

Freight does better when it is slow and cheap per ton mile. They also tend to be long to save on labor costs. Passenger rail is pretty much the direct opposite, requiring fast acceleration and speed. So the two do not mix well (freight trains will slow down passenger trains.) The only country that operates both high speed rail and freight successfully, by China, literally built a whole separate new high speed network to reserve for passenger trains and to leave freight the freed up space on legacy lines.