The Cl.121 DMBS was one of several retained at Canton at that time, semi-permananetly coupled to Class 120 (Buffet)Swindon Cross Country units.
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Also used were two Cl.116 power cars 50090 and 50132.
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They were diagrammed for use on the 2M67 and 2V67 North & West Route services between Cardiff and Crewe in order to increase the power to weight ratio of the cross country units.
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The Cl.116 /121 cars were locked out of use, with related notices stuck to the passenger compartment doors.
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Examples being:-
22/02/1971 - (55023)+(50705+59265+50647)+(50662+59260+50699)
12/03/1971 - (50647+59265+50705)+(55026),
20/03/1971 - (50132)+(50648+59296+50706), (50660+59266+50729)+(55023)
05/04/1971 - (55026)+(50729+59266+50660),
12/04/1971 - (50679+59291+50723)+(55023),
13/04/1971 - (50683+59294+50735)+(50132),
14/04/1971 - (50693+59299+50738)+(55026),
24/04/1971 - (50683+59294+50735)+(55024), (50647+59265+50705)+(50738+59299+50693)+(55025),
01/05/1971 - (55025)+50705+59265+50647)+(50132), (55026)+(50660+59266+50729),
08/05/1971 - (55023)+(50705+59265+50647)+(55022)+(50723+59278+50674), (55024)+(50693+59299+50738),
02/06/1971 - (50686+50733)+(50683+59294+50735)+(55022)
24/06/1971 - (55022)+(50729+59266+50660), (55025)+(50674+59278+50723),
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Brian R