Where was John Surratt on April 14, 1865 ?

[Gene C]

The travel time from Philadelphia to Burlington (VT?) doesn't seem right.
According to MapQuest it's about 370 miles.

If it's Burlington NJ (on the way to NY City), that doesn't help him get to Elmira or Montreal any faster.

If John is trying to have an alibi of being in Elmira, I don't see how he could possibly be in Elmira and then Washington (or visa versa) in a 24 hour period.
Is it possible his job was to assassinate Johnson, but when Grant shows up in Washington, he gets assigned to kill him instead and Atzerodt gets assigned to Johnson?

With that scenario, John is on a train headed back north, and possibly no intention of killing Grant.
Since the train doesn't leave Philadelphia until 6AM it's possible this is when and where he hears that Lincoln has been shot. Now what would you do in his shoes?

I don't know enough to speculate further, but you know enough that within another 24 hours, it's very likely everyone is going to be looking for you.