refactor: Simplify how train departureDate is passed on callbacks

[viliket]

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (af9e09c) 99.00% compared to head (7065050) 99.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #19   +/-   ##
=======================================
  Coverage   99.00%   99.00%           
=======================================
  Files          28       28           
  Lines         602      602           
  Branches      166      166           
=======================================
  Hits          596      596           
  Misses          6        6           

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