id	keyword
ap-5287	crossing
ap-5287	figure
ap-5287	features
ap-5287	track
ap-5287	acceleration
ap-5287	analysis
ap-5287	system
ap-5287	railway
ap-5287	lifetime
ap-5287	regression
ap-5287	principal
ap-5287	spectral
ap-5287	monitoring
ap-5287	impact