Not just cleaning, based on the distance traveled, this train should get Secondary maintenance at BJU. If a train convers more than 3500km in a roundtrip, it requires SM at the destination station. I believe this has been extended to 4000km for LHB trains in recent years.
And SM is basically the same as PM, requiring the rake to be stabled at the pitline and undergo regular maintenance.
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Either they have an additional rake or they got an exception to avoid SM for this train.