Was there an assassin on Grant's train?

[L Verge]

Roger, despite the Johnson mentioning, the only "references" that come to my mind is her writing such as "since that terrible bereavement", but I cannot recall she specified anything further.

I haven't read this, but maybe it will help?

http://quod.lib.umich.edu/j/jala/2629860...w=fulltext

I just skimmed it and found virtually nothing that speaks directly to the issue of whether or not Mrs. Lincoln ever wrote specifically of the assassination.