901002
This unit was converted in 1991, also from a power twin unit. It was rebuilt by the Research & Development Division (R&DD) of British Rail as a test train known as "Lab 19 - Iris II", supplementing the original "Test Coach Iris", which was a former-Derby Lightweight single-car unit. It was used initially for radio survey work particularly with the National Radio Network (NRN) and later for video survey work including extensive signal sighting on the WCML prior to the introduction of 125 miles/h running.
| DM | DM | |
|---|---|---|
| 977692 (ex-53222) | + | 977693 (ex-53338) |
Like 901001, this unit has carried various liveries, starting with BR Research's silver and grey livery, similar to that carried by 901001. This was followed by Serco red/grey, Railtrack Blue/lime green, and most recently the latest Network Rail all-over yellow livery. This unit was withdrawn and stored at Derby's Railway Technical Centre and was sold by Network Rail to a private buyer in early 2008. It is now resident at Dunster station on the West Somerset Railway, where it has been re-painted into BR green and will be used on Pway trains.
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Read more about this topic: British Rail Class 901