This might be it? Wouldn’t this seem a likely reason for a train crash? Something like this: Train crashes, Republicans killed/injured. FBI MEETS WITH PRES TO CHANGE MEMO? GIVES Schifty a possible angle?
[AS] writes letter to select cmte (last ditch effort to save his own ass and others-repay favor) calling for a NEW VOTE. Now with Rep. congressmen being absent to vote. Memo is denied release because Dems hold majority from TRAIN incident?