====== Railmiles PowerQuery Columns ======
For RailMiles CSV Export in Excel

<code>
// Duration
[time_arrival_act] - [time_departure_act]

// Avg Speed
[distance_miles] / Duration.TotalHours([Duration])

// Lateness
Duration.TotalMinutes([time_arrival_plan] - [time_arrival_act])*-1
</code>