There are no numbers on this coach protype numbering options are:
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ADB975051 (or RDB975051) — Test Car 5:
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Role: Mobile instrumentation and support coach.
- Significance: This coach traveled all over the UK rail network and famously served as a monitoring car during high-speed trials with the Advanced Passenger Train (APT) and early HST power cars.
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RDB975136 — Laboratory 12:
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Role: Acoustics and track dynamics research vehicle.
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Significance: Used heavily by the Derby research teams to measure noise, vibration, and track interactions at high speeds.
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Look: Identical blue and red livery, often run in the same test formations as Test Car 5.
