SMART
Also: berth offsets, berth mapping
Network Rail’s list of which berth steps mean a train arrived at, left or passed a place.
A berth step on its own only says a headcode moved. SMART is reference data that ties particular steps to a place: “a step from this berth to that one means the train just left Reading”.
It also gives an offset in seconds, because the step can happen a little before or after the train actually reaches the platform.
In Trainiac
The live map’s best anchors come from berth steps SMART ties to a place.