Old suspense movie, a woman pretend to be the wife on a train
Old movie, between 1930-1970. perhaps black and White?
A man and a woman is planning to kill (or already had?) the wife of that same man. The wife was going on a planned trip with train and The woman took her place and was to pretend that She was the wife. She weared the wifes clothes and luggage and got on the train. She had a hat of the wifes that would cover her face. They wanted everyone to see her leave, that was really important. The luggage was going to her Mothers place, i Think.
Also a fake letter was sent to the man from the wife, it was not from the wife but they wanted it to look like it was from her. Something happened and She, the woman, raised suspicion among some passengers on the train somehow i think. She was not the real wife and someone Who knew the wife was on to her, i Think.
The investigation of the missing wife started, and soon the man was suspected having a finger in her disappearence.
Any clue which movie this is?