Layer Estimates:

Layer: 50k for 50th - Trackpoints (ID:0)
Count: 50000
Extent:

XMin: -13579337.0001
YMin: 4462550.9999
XMax: -13561641.9999
YMax: 4467493.0001
Spatial Reference: 102100 (3857)

Layer: 50k for 50th (ID:1)
Count: 1
Extent:

XMin: -13579337
YMin: 4462551
XMax: -13561642
YMax: 4467493
Spatial Reference: 102100 (3857)