This test train originally consisted of two skeletal cars (PC3 - RDB975634 and PC4 - RDB975635) each having one mock up power bogie (P) and connected with an unpowered articulated trailer bogie (0) in between hence the nickname 'P-O-P'.
It was used from September 1971 as a test bed to prove the APT-E suspension, tilting and braking systems.The 'Power pumps' were only mock-ups, although similar externally to PC1 and PC2 in the APT-E unit minus cabs, and the whole set had to be hauled by a locomotive.
Later the P-O-P train was modified with an APT-P vehicle (Laboratory 8 - 'PILOT' RDB975636) being built and formed between the original two vehicles, which were re-mounted on revised articulated bogies and given body cladding.
The three vehicle set then performed bogie and ride research work, mainly on the West Coast Main Line.
Following the abandonment of the APT project, all three vehicles were scrapped in 1985.
The set was eventually formed as follows:
A great deal of testing was carried out at the Old Dalby test track in connection with the APT development programme using POP train.
On 10th January 1973 a test train heading north on the test track 'ran out of road' whilst carrying out a high speed test with the 'POP' train and finished up 'on the floor'. Rumour had it that the brakes on the 'Peak' were incorrectly adjusted and the decision to apply the brakes was left until the last second.
For more information and pictures look here
Pictures courtesy of Kit Spackman except where otherwise credited
The original POP train passes Melton
Junction en route to the Old Dalby test track
|The Research Division, Clayton Class 17
loco No: 8512 sets off for Asfordby from the north end of the test track
on 14th October 1971.
Another view at Edwalton at Old Dalby
|POP train on the Widmerpool straight
at Old Dalby
|POP train in its second guise with panels covering the bare frames pictured in the RTC sidings
|Close up inside the R&DD Test Hall
|In RTC sidings with Laboratory 8 'Pilot' in the formation
|Lab 8 'Pilot' in RTC sidings
|PC4 975635 at RTC on 15th
|At the Old
Dalby test track
Main line runs
At Crewe showing the articulated bogie
in the early 1970s
|47314 departing Peterborough
on 26th March 1979
Approaching Preston from the north in the
|Behind 50028 somewhere
PC4 975635 and Lab 8 Pilot at Crewe on 9
|PC3 975634 at Crewe on 9 August 1982
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