Updated: 19 September 2025

Mostyn Coaching Stock Formations

As well as information from enthusiasts' observations made in 1977, the document on which the coaching stock formations on Mostyn are based is the British Railways LMR Passenger Train Marshalling Circular for 2nd May 1977 to 7th May 1978

We were lucky that a copy of this was loaned to BMRG member David Goodwin by Bill Rear some 20 years ago when the relevant sections for the North Wales Coast were typed up for future reference. Along with the observations from 1977, this data is used as the basis for the three bigger Mk 1 coach rakes used on Mostyn as well as for the planned Mark 2 and Mark 3 rakes.

If you click here, BMRG present a ‘North Wales Coast’ version of the Coaching Stock Marshalling Circular, formatted in the style of the original document.

Although the LMR Marshalling Circular has been followed as faithfully as possible we acknowledge that mistakes may exist, and this is certainly the case where paper additions to the original document meant that other earlier data were obscured. Where some of the obscured data were recorded in the notes made in the mid-90s, this is shown in red.

Addendum - Since this information was first added to the BMRG website, the BR Passenger Train Marshalling Circular described above, along with a second copy, is now in the possession of Robert Carroll.  Robert has a groups.io egroup called BRCoachingStock dedicated to all things related to 'British Railways operated coaching stock'; he and other members of the group have spent time and effort collecting and creating electronic copies from these Marshalling Circulars, including those relevant to 1977.  Readers are well advised to join this group if they are interested in the history and operation of BR coaching stock.

Mark 1 Coaching Stock Formations

Mark 2 Pressure-Ventilated Coaching Stock Formations

Prototype:	1D84 21 10 (SO) Euston to Holyhead Mark 2 Vacuum Braked NOT TO EXCEED 14 VEHICLES FROM EUSTON
Model:	Built by David Faulkner & Richard Oldfield, based on Bachmann, introduced June 2016

Coach	Booked Formation	Actual Formation	Number	Diag.	Bogies	Lot no.
L	+ SLCT	Mk I SLC	M2434	5	Commonwealth	30591/60
K	* BSO	Mk II BSO	M9384	185	B4	30757/66
J	* TSO	Mk II TSO	M5127	88	B4	30751/65-7
H	* TSO	Mk II TSO	M5085	88	B4	30751/65-7
G	* FO	Mk I FO	M3111	73	B4	30697/62-3
F	* RBR	Mk I RB	M1709	24	Commonwealth	30512/60-1
E	* TSO	Mk II TSO	M5106	88	B4	30751/65-7
D	* TSO	Mk II TSO	M5105	88	B4	30751/65-7
C	* TSO	Mk II TSO	M5118	88	B4	30751/65-7
B	* FK	Mk II FK	M13429	122	B4	30749/64-5
A	* BFK	Mk II BFK	M14045	162	B4	30756/66
-	* BG (NEV)	Mk I BG (NEV)	M81440	711	B4	30400/57-9
-	* BG (NEV)	Mk I BG (NEV)	M81624	711	B4	30725/62-3
-	+ BG (NDV)	Mk I BG (NEV)	M81393	711	BR STD Mk II	30400/57-9

Prototype:	1A45 10 04 Holyhead to Euston Mark 2 Air Braked
Model:	Built by David Faulkner & Richard Oldfield, based on Bachmann, introduced June 2016

Coach	Booked Formation	Actual Formation	Number	Diag.	Bogies	Lot no.
A	* BFK	Mk IIC BFK	M14129	165	B4	30796/69-70
B	* FK	Mk IIC FK	M13541	125	B4	30797/69-70
C	* FO (a)	Mk IIC FO	M3163	80	B4	30810/70
D	* RMB	Mk I RBR (ex RBK)	M1626	33 #	Commonwealth	30633/62
E	* TSO	Mk IIC TSO	M5566	106	B4	30795/69-70
F	* TSO	Mk IIA TSO	M5414	86	B4	30787/68
G	* TSO	Mk IIA TSO	M5262	86	B4	30776/67-8
H	* TSO	Mk IIC TSO	M5526	106	B4	30795/69-70
J	* TSO	Mk IIC TSO	M5530	106	B4	30795/69-70
K	* TSO	Mk IIC TSO	M5563	106	B4	30795/69-70
-	* BG (NEA)	Mk I BG (NEA)	M81591	711	B4	30715/62
-	* BG (NEA)	Mk I BG (NEA)	M81088	711	B4	30228/57-8
-	-	Mk I RMB	M1867	99	B4	30702/62

(a) - declassified on Sats
# - Converted from RBK (diagram 28), later became design code AJ 415 1A

---

Mark 2 / Mark 3 Air-conditioned Coaching Stock Formation

Prototype:	1D53 10 25 (SO) Euston to Llandudno (runs 4 June to 10 Sept.) Mk 2+3 Air conditioned
Model:	Built by - David Faulkner & Richard Oldfield

Coach	Booked Formation	Actual Formation	Number	Diag.	Bogies	Lot no.
A	@ BSO	Mk2F BSO	M9520	189	B4	30861/74
B	% TSO	Mk3A TSO	M12017	111	BT10	30877/75-7
C	% TSO	Mk3A TSO	M12165	111	BT10	30877/75-7
D	% TSO	Mk3A TSO	M12150	111	BT10	30877/75-7
E	% TSO	Mk3A TSO	M12029	111	BT10	30877/75-7
F	* RBR	Mk I RBR (ex RBK)	M1775	33 #	Commonwealth	30633/62
G	@ FO (a)	Mk2F FO	M3302	83	B4	30845/73
H	@ FO (a)	Mk2F FO	M3340	83	B4	30859/73-4
J	@ FO (a)	Mk2F FO	M3323	83	B4	30859/73-4
K	@ FO	Mk2F FO	M3314	83	B4	30845/73
	* BG (NEA)	Mk I BG (NEA)	M81500	711	B4	30484/58

(a) - declassified
# - Converted from RBK (diagram 28), later became design code AJ 415 1A



% - Electric Heated Vehicle (mark 3) 125 M.P.H.
@ - Electric Heated Vehicle 100 M.P.H.
*  - Dual Heated Vehicle 100 M.P.H.
+ - Dual Heated Vehicle

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