No bro, the train you are talking about is ANVT-SVDK special, which runs with a prototype self generating LHB rake. Seems you're getting confused by seeing the livery. This is a self-generating SLR H-LHB coach.
You may be correct as the coach might have been replaced with a pure SG LHB coach. But as far as i remember, H-LHB SLR was regular with it, as shown in pic.
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