path_track
path_track is a point entity available in all 
GoldSrc games. Multiple path_tracks form a path that can be followed by a func_tracktrain.
Key Values
Targetname:
- Name
(targetname)<targetname> - The targetname that other entities refer to this entity by.
Angles:
- Pitch Yaw Roll (Y Z X)
(angles)<angle> - This entity's orientation in the world. Pitch is rotation around the Y axis, yaw is the rotation around the Z axis, roll is the rotation around the X axis.
- Next stop target
(target)<targetname> - Name of the next path_corner in the path.
- Fire On Pass
(message)<targetname> - Trigger an event when this path_corner is passed by the entity using the path.
- Branch Path
(altpath)<targetname> - The name of a secondary path_track.
- Fire on dead end
(netnamed)<targetname> - If this path_track is a dead-end, activate this event on reaching.
- New Train Speed
(speed)<integer> - As the train passes this point, this speed will be assigned to it.
Flags
- [
1] : Disabled
- [
2] : Fire once
- [
4] : Branch Reverse
- [
8] : Disable train
