The manual does not contain the usual section/chapter for resetting It does state 0 is the reset:
0 Stops and resets the Dash 9.
Resets the Dash 9’s direction to
FORWARD. Resets Railsounds II to
automatic RPM operation. HORN BLOWS.
RPMS RETURN TO AUTOMATIC.
Here is link to the manual just in case you do not have one.
sdfsd