No its not about people sleeping! The track maintenance crew is working on the Kalfjeslaan to refurbish the siding. Among other things, wooden sleepers are being replaced with so‑called duobloc sleepers: a type of railway sleeper consisting of two separate concrete blocks connected by a steel or concrete cross‑bar. Because these works are taking place at the only passing loop between the Zuiderhof depot and Molenweg, tram service can only be operated by a single tram at a 45‑minute frequency.

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