What is the best option to film a running train by PV2+?

[AAC]

I want to follow a running train for 2 km and do aerial filming over it. The train running along the shorelines will make some turns. Therefore, if pV2+ following the train, loss of sight will happen.
Ground Station Waypoints can be one of the easy options but the flying speed is fixed in Slow/Mid/Fast, I'm not sure if it will follow the train in constant speed. Course Lock mode looks good but will lost control or camera signal when train turns to other side of the forest.
Any suggestion ?
Thanks.

 

[ilovecoffee]

Will the train be going slow enough for you to keep up with it?

If you use Ground Station (and you'd have to use my modded one to go over 2km), you'll still lose time when it reaches each waypoint, even with my mod of removing those pauses, since it has to decelerate to each waypoint.

Something to keep in mind. If you lose sight, seems like your only bet is GS.