Rail Data TOPS Code/Class Details

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TOPS Code/Class:	121
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TOPS Category: ?This is my own (unofficial) means to categorise TOPS codes based on what they relate to and whether they are long (4 characters, i.e. including sub-codes) or short (3 characters)	SM - Short Code, Multiple Units
TOPS GENKOC: ?The first character of a TOPS code is known as the GENKOC and indicates the general type of rolling stock (e.g. 1xx are DMUs).	1 - Diesel-Mechanical Multiple Units
TOPS BRAKTY: ?The third character of many TOPS codes is the BRAKTY, indicating the type of braking equipment fitted (e.g. A indicates air brakes).	* - Not defined by code
Description:	Pressed Steel Single DMU
Numbers: ?Numbers are only shown where the ranges were limited. Otherwise, refer to the listings section below. The letter r after the numbers indicates this is a range, with not all numbers in the sequence used.	55020-55035 plus 54280-54289/56280-56289
Status:	Defunct
Date On:	c.1974
Origins:	TOPS classification
Date Off:
Destiny:	Withdrawn

Sub-codes ?If this code had any sub-codes, they will be listed here.
None found

Designs/Diagrams ?Design codes and diagrams related to this code (and any sub-codes where relevant) are listed here.
2 designs/diagrams currently listed against this TOPS code/class (including any sub-codes).

Design	Class	Series	Description	Status
DQ221		BR TOPS Carriage Diagram	Class 121 Driving Motor Brake Second (DMBS)	Defunct
DS201		BR TOPS Carriage Diagram	Class 121 Driving Trailer Second (DTS)	Defunct

Batches ?Batches of numbers built or converted to this TOPS code are listed below. Note that only codes that were wholly to this code will appear, otherwise refer to the listings section for other numbers.
There are 4 batches recorded as being wholly to this TOPS code (including any sub-codes).

Numbers	Class	Origin	Qty	Type	Built/Converted	Date/s	Lot
54280-54289r	121	Renumbered	8	Class 121 DTS	-	1983
55020-55035	121	New	16	Class 121 DMBS	Pressed Steel	1961	30518
56280-56289	121	New	10	Class 121 DTS	Pressed Steel	1961	30519
121027-121121	121	Renumbered	0	Class 121 DMU

Notes
No notes have been left yet. ?There may be some notes posted but which have not yet been approved.

Profiles ?Profiles provide an overview of the histories of various types of train. Profiles that are relevant to this TOPS class/code are listed below. If no profiles are shown, try looking under the parent code (in main details section above)

Listings
There are 28 listings (with 27 distinct numbers) for this TOPS code/class (not including any sub-codes).

Date ?The date of the listing. Newest listings are shown first.	Type ?Listings are either plain listings (reported details at a given date) or changes (changes of details on a given date). Hover over a code for the explanation.	Status ?The status of this number at (or after) the given date. Hover over a code for the explanation.	Prefix ?The prefix carried at the given date. Hover over a prefix for an explanation.	Number	TOPS	Design	Pool	Livery	Allocation	Location	Notes	?Shows the approval status of each listing. Hover over an icon for an explanation.
01/01/2019	LListing (e.g. in an ABC)	AExtant, Registered, Active	Click here for more details of this prefix	55034	121			BR green	Crewe LNWR Heritage			Approved, auto/admin
01/01/2019	LListing (e.g. in an ABC)	AExtant, Registered, Active	Click here for more details of this prefix	121034	121			BR green	Crewe LNWR Heritage			Approved, auto/admin
05/2000	LListing (e.g. in an ABC)	AExtant, Registered, Active	Click here for more details of this prefix	121027	121		NGBX	Silverlink purple/green	Bletchley Depot			Approved, auto/admin
05/2000	LListing (e.g. in an ABC)	AExtant, Registered, Active	Click here for more details of this prefix	121029	121		NGBX	Silverlink purple/green	Bletchley Depot			Approved, auto/admin
05/2000	LListing (e.g. in an ABC)	AExtant, Registered, Active	Click here for more details of this prefix	121031	121		NGBX	Network SouthEast	Bletchley Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	55020	121	DQ221			Reading Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	55021	121	DQ221			Reading Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	55022	121	DQ221			Reading Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	55023	121	DQ221			Reading Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	55024	121	DQ221			Reading Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	55025	121	DQ221			Laira Depot (Plymouth)			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	55026	121	DQ221			Laira Depot (Plymouth)			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	55027	121	DQ221			Reading Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	55028	121	DQ221			Reading Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	55029	121	DQ221			Reading Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	55030	121	DQ221			Reading Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	55031	121	DQ221			Reading Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	55032	121	DQ221			Bristol Bath Road Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	55033	121	DQ221			Bristol Bath Road Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	55034	121	DQ221			Reading Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	56280	121	DS201			Reading Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	56281	121	DS201			Reading Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	56283	121	DS201			Reading Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	56284	121	DS201			Reading Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	56285	121	DS201			Reading Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	56286	121	DS201			Reading Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	56287	121	DS201			Reading Depot			Approved, auto/admin
01/01/1982	LListing (e.g. in an ABC)	AExtant, Registered, Active	WAllocated to the Western Region Click here for more details of this prefix	56289	121	DS201			Reading Depot			Approved, auto/admin

Date ?The date of the listing. Newest listings are shown first.

Type ?Listings are either plain listings (reported details at a given date) or changes (changes of details on a given date). Hover over a code for the explanation.

Status ?The status of this number at (or after) the given date. Hover over a code for the explanation.

Prefix ?The prefix carried at the given date. Hover over a prefix for an explanation.

Number

TOPS

Design

Pool

Livery

Allocation

Location

Notes

?Shows the approval status of each listing. Hover over an icon for an explanation.

01/01/2019

LListing (e.g. in an ABC)

AExtant, Registered, Active

Click here for more details of this prefix

55034

121

BR green

Time / Date	Edited by	Change
18:09 on Mon 30/05/2022	Thomas Young	Improved details
18:09 on Mon 30/05/2022	Thomas Young	Key photo added