Did Robert Lincoln Ride the Funeral Train to Baltimore?

[STS Lincolnite]

A couple of thoughts.

Kees, when you speak of "the vault" are you talking about the receiving vault or the temporary tomb?

The receiving vault would not have been sealed as it was only temporary storage for the deceased before moving to their final interment space.

I am not sure about the temporary vault/tomb that Lincoln was in before his final interment in the permanent tomb. Sealing the tomb, from what I understand, is typically done for security (and maybe to help protect against weathering depending on location). To provide more protection from desecration or grave robbery. It would certainly provide more protection that a lock which could be broken. And with what we know in retrospect about attempts to steal Lincoln's body, it would have been wise.