Rheinbrücke Eglisau

Image-based damage mapping of a historic railway bridge for SBB.

Client: SBB CFF FFS
Location: Eglisau, ZH
Material: Masonry

Inspection images: 15,000
Images acquired automatically: >13,500
Stones identified: 88,000

Masonry · Railway infrastructure

Crack mapping and masonry segmentation

Structure and inspection scope

Built between 1895 and 1897, Rheinbrücke Eglisau is a historic masonry railway bridge.

Inspection methodology

The inspection combined drone acquisition with detailed image analysis. Of 15,000 inspection images, more than 13,500 were collected automatically along a predefined flight path. SwissInspect used image-based inspection and AI to map cracks at pixel level and classify them by width. The analysis also identified deteriorated masonry and approximately 88,000 individual stones. A machine learning model was then used to classify these stones into several categories including mortar stones, natural stones, etc.

Inspection results

Mapped cracks and individual stones give engineers a detailed visual record to help interpret the condition of the masonry and plan further assessment.

SwissInspect / YouTube