Rerail vs Derail - What's the difference?

In lang=en terms the difference between rerail and derail

is that rerail is to replace on the rails while derail is to cause to deviate from a set course or direction.

is that rerail is to replace on the rails while derail is to cause to come off the tracks.

a device placed on railway tracks causing a train to derail.

(en verb)

To replace on the rails.

(Webster 1913)

(wikipedia derail)

(en noun)

A device placed on railway tracks causing a train to derail.

The derail was placed deliberately so that the train would fall into the river.

(en verb)

To cause to come off the tracks.

The train was destroyed when it was derailed by the penny.

To come off the tracks.

To deviate from the previous course or direction.

The conversation derailed once James brought up politics.

To cause to deviate from a set course or direction.

The protesting students derailed the professor's lecture.

* (English Citations of "derail")

* derailment