For at least the stations between Germantown and Union, the signals are either visible or in close proximity. Most of the time, you'll hear the engineer radio departing the station DIB. And in such case, they're max I believe is medium speed. But the next signal comes into view in less than a minute. In most cases the next signal comes into view before the train reaches medium speed in the first place. I hardly if ever even notice the DIB speed restrictions for that reason. I can't think of anywhere where even if the entire crew forgot, they could get up enough speed to have a problem at the next signal. And even if the crew forgot, it doesn't take a mile to stop a 6 car passenger train either. The signals have decent line of sight and the train can stop fairly quickly. The engineer and conductors radio every signal they pass. And they radio every station departure with signal condition. Put simply, I don't see how those circumstances could repeat themselves today short of a passenger hijacking the train.