Bogies and Bodyshells

[NIR]

NIR railcars were British outline but I am confused about how the various BR bogies and bodyshells map to the NIR railcar classes.

Is it as simple as all the 70 Class bodyshells are BR mark 1 (flat ends) and all the 80 Class are BR mark 2 (rounded ends, wrap around doors? mark2 2a 2b or 2c?) or does it depend? Are the unpowered bogies B1, Commonwealth or B4? What about the motor bogies? Any bogies swapped around later on?

I never really noticed that stuff at the time so just looking for some clarity.

(I expect MEDs and MPDs are going to be more exception than rule...)

Edited May 6, 2019 by NIR

[Dhu Varren]

The MED and MPD railcars are a very mixed bunch. Some MEDs and all the MPDs and their trailer cars were converted from existing coaches of LMSNCC origin. Other MEDs and trailers were built new to a UTA design. Bogies were basically LMS type with roller bearings.

70 Class power cars were built new to a design similar to LMSNCC coaches, but the trailer cars were converted from UTA and GNR coaches. Bogies on the trailer cars were, like the MEDs and MPDs, basically LMS type with roller bearings.

Bogies on the power cars were of a UTA design, and there is nothing similar as far as I am aware.

The 80 Class railcars and trailers were built to the BR Mk2b design, with one or two trailers converted from loco hauled MK2c coaches to replace vehicles damaged by terrorist activity. Bogies on the trailers were B4 type, but on the power cars the bogies used were similar to those on the BR Class 73 locos.

The 450 (Castle) class railcars and trailers were built to a Mk3 design, mounted on ex BR Mk1 underframes. The bogies used were the same as for the 80 Class, with B4s on the trailers, and on the power cars bogies that were similar to the BR class 73 locos were used.

[NIR]

On 3/11/2019 at 4:01 PM, Dhu Varren said:

70 Class power cars were built new to a design similar to LMSNCC coaches, but the trailer cars were converted from UTA and GNR coaches. Bogies on the trailer cars were, like the MEDs and MPDs, basically LMS type with roller bearings. 

Bogies on the power cars were of a UTA design, and there is nothing similar as far as I am aware.

BR Class 123 Swindon DMU looks fairly close except for dampers arranged laterally on the 70 Class

https://c1.staticflickr.com/7/6068/6159701979_7db710a41e_b.jpg

http://martynhilbert.railpic.net/gallery/albums/userpics/10002/IMG_0060_28800x58229.jpg

 

B5 bogies with a final drive apparently

https://www.railcar.co.uk/type/class-123/description

 

These things with dampers rearranged

http://www.replicarailways.co.uk/spares-and-accessories/accessories

 

Looks like I have started the 70 Class build!

Edited May 6, 2019 by NIR

[Dhu Varren]

The 70 Class power car bogies certainly bear a resemblance to the B5 bogie in some respects. The B5, with modifications, would probably make a passable representation in the absence of anything better for a model of a 70 Class.     

[Mayner]

Diesel Dawn  Colm Flanningan 2003 is a useful source of information ( including drawings and photographs) on diesel railcar development in Northern Ireland  https://www.amazon.com/Diesel-Dawn-Northern-Ireland-Development/dp/1904242081

[hexagon789]

On 3/12/2019 at 1:03 AM, Dhu Varren said:

The 70 Class power car bogies certainly bear a resemblance to the B5 bogie in some respects. The B5, with modifications, would probably make a passable representation in the absence of anything better for a model of a 70 Class.     

 

I believe Mk6 motor bogie would be the designation for an 80 Class power bogie. They look identical to the motor bogies of BR Southern Region Electric Multiple Units and those power bogies (also fitted to Class 73 Electro-Diesels) were coded Mk. 6 by BR.

The Mk6 is a development of the B4 design.

[hexagon789]

The 70 Class ones do look lighter - more akin to a B5 as you say.