This Saturday, May 7, will be National Train Day. The Mileage Tally will track trips and miles associated with National Train Day as a "Special Event." In almost all cases, you will not have to do anything to have your NTD miles included in the event tally. You should just post your trips as you normally do, and I'll take care of the rest.
Any trips taken on May 7 or that include travel on May 7 will be added to NTD totals automatically. Even if your trip on May 7 was not related to NTD events, if you travelled on National Train Day, it will count as NTD miles. In addition, any trips made before or after May 7 that were specifically for attendance at NTD events will also count. Someone who travels to Washington on May 6, then returns on May 8, will have the May 6 and 8 trips included in the NTD event total. In most cases I'll be able to figure that out, but if your trip is not obviously NTD related, or you just want to make sure I'm not sleeping at the keyboard, you could mention the NTD connection, and I'll make sure to add it to the event totals.
The only exception would be for a long, circular, multiple day trip that begins, ends, or includes a stop at a site hosting an NTD event. In that case, I'll only count the directly related NTD segments. Of course, the entire trip will count for the Tally.
So, the bottom line is that trips to and from National Train Day events, or any trips that take place on May 7, will count toward the NTD Special Event total. You should not have to do anything on your end to make that happen.
Last year's NTD event total was 2,130 miles and 24 segments.